20806 (number)
20,806 (twenty thousand eight hundred six) is an even fivedigits composite number following 20805 and preceding 20807. In scientific notation, it is written as 2.0806 × 10^{4}. The sum of its digits is 16. It has a total of 3 prime factors and 8 positive divisors. There are 10,200 positive integers (up to 20806) that are relatively prime to 20806.
Basic properties
 Is Prime? No
 Number parity Even
 Number length 5
 Sum of Digits 16
 Digital Root 7
Name
Short name  20 thousand 806 

Full name  twenty thousand eight hundred six 
Notation
Scientific notation  2.0806 × 10^{4} 

Engineering notation  20.806 × 10^{3} 
Prime Factorization of 20806
Prime Factorization 2 × 101 × 103
Composite numberω(n)  Distinct Factors  3  Total number of distinct prime factors 

Ω(n)  Total Factors  3  Total number of prime factors 
rad(n)  Radical  20806  Product of the distinct prime numbers 
λ(n)  Liouville Lambda  1  Returns the parity of Ω(n), such that λ(n) = (1)^{Ω(n)} 
μ(n)  Mobius Mu  1  Returns:

Λ(n)  Mangoldt function  0  Returns log(p) if n is a power p^{k} of any prime p (for any k >= 1), else returns 0 
The prime factorization of 20,806 is 2 × 101 × 103. Since it has a total of 3 prime factors, 20,806 is a composite number.
Divisors of 20806
8 divisors
τ(n)  Total Divisors  8  Total number of the positive divisors of n 

σ(n)  Sum of Divisors  31824  Sum of all the positive divisors of n 
s(n)  Aliquot Sum  11018  Sum of the proper positive divisors of n 
A(n)  Arithmetic Mean  3978  Returns the sum of divisors (σ(n)) divided by the total number of divisors (τ(n)) 
G(n)  Geometric Mean  144.24285077604  Returns the nth root of the product of n divisors 
H(n)  Harmonic Mean  5.2302664655606  Returns the total number of divisors (τ(n)) divided by the sum of the reciprocal of each divisors 
The number 20,806 can be divided by 8 positive divisors (out of which 4 are even, and 4 are odd). The sum of these divisors (counting 20,806) is 31,824, the average is 3,978.
Other Arithmetic Functions (n = 20806)
φ(n)  Euler Totient  10200  Total number of positive integers not greater than n that are coprime to n 

λ(n)  Carmichael Lambda  5100  Smallest positive number such that a^{λ(n)} ≡ 1 (mod n) for all a coprime to n 
π(n)  Prime Pi  ≈ 2347  Total number of primes less than or equal to n 
r_{2}(n)  Sum of 2 squares  0  The number of ways n can be represented as the sum of 2 squares 
There are 10,200 positive integers (less than 20,806) that are coprime with 20,806. And there are approximately 2,347 prime numbers less than or equal to 20,806.
Divisibility of 20806
m  2  3  4  5  6  7  8  9 

n mod m  0  1  2  1  4  2  6  7 
The number 20,806 is divisible by 2.
Classification of 20806
By Arithmetic functions
 Arithmetic
 Deficient
Expressible via specific sums
 Polite
By Powers
 Square Free
Other numbers
 Sphenic
Base conversion (20806)
Base  System  Value 

2  Binary  101000101000110 
3  Ternary  1001112121 
4  Quaternary  11011012 
5  Quinary  1131211 
6  Senary  240154 
8  Octal  50506 
10  Decimal  20806 
12  Duodecimal  1005a 
16  Hexadecimal  5146 
20  Vigesimal  2c06 
36  Base36  g1y 
Basic calculations (n = 20806)
Multiplication
n×yn×2  41612 

n×3  62418 
n×4  83224 
n×5  104030 
Division
n÷yn÷2  10403.000 

n÷3  6935.333 
n÷4  5201.500 
n÷5  4161.200 
Exponentiation
n^{y}n^{2}  432889636 

n^{3}  9006701766616 
n^{4}  187393436956212496 
n^{5}  3898907849310957191776 
Nth Root
^{y}√n^{2}√n  144.24285077604 

^{3}√n  27.504021450464 
^{4}√n  12.010114519689 
^{5}√n  7.3052943384309 
20806 as geometric shapes
Circle
Radius = nDiameter  41612 

Circumference  130727.95350118 
Area  1359962900.2728 
Sphere
Radius = nVolume  37727184137433 

Surface area  5439851601.091 
Circumference  130727.95350118 
Square
Length = nPerimeter  83224 

Area  432889636 
Diagonal  29424.127378735 
Cube
Length = nSurface area  2597337816 

Volume  9006701766616 
Space diagonal  36037.049102278 
Equilateral Triangle
Length = nPerimeter  62418 

Area  187446710.9055 
Altitude  18018.524551139 
Triangular Pyramid
Length = nSurface area  749786843.622 

Volume  1061449982549.8 
Height  16988.027862782 
Cryptographic Hash Functions
md5  541cf8e1355332b5f4bf6d96aca9b925 

sha1  d6142cbf81ec56ed10999a7010c83a3df7006f1f 
sha256  d08abe51a706d09334bbb5329862ce3f48952693ba280a3897938fdd900b7bb0 
sha512  19d0af4281bc2fb8f76d87e23df1446eebaeb529d3a918a645baa78d49421b2464f3f8689ec4650aeca9ec5ab86e627cc10d67dda00d899ed88698bc4f739050 
ripemd160  16b447d752c1cb0caecf4d627823e0a5287f6336 