Properties of the Number 20850

Twenty Thousand Eight Hundred Fifty

Basics

Value: 20849 → 20850 → 20851

Parity: even

Prime: No

Previous Prime: 20849

Next Prime: 20857

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 2 × 3 × 5 ² × 139

Divisors: 1, 2, 3, 5, 6, 10, 15, 25, 30, 50

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101000101110010

Octal: 50562

Duodecimal: 10096

Hexadecimal: 5172

Square: 434722500

Square Root: 144.39529078193652

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Row sums of A168281. A168380

Numbers k such that the digits of σ(k) are a permutation of those of k, in base 10. A115920

Number of points of L1 norm 3 in cubic lattice Zⁿ. A35597

a(n) = a(1) + a(2) + ... + a(n-1) + a(m) for n >= 4, where m = 2^p+1 + 2 - n and p is the unique integer such that 2^p < n - 1 <= 2^p+1, starting with a(1) = a(2) = a(3) = 1. A49933

Triangle T(n,k), 0<=k<=n, of coefficients of polynomials P_n(x) related to convolution of the k-fold factorials. A113129

G.f. A(x,y) satisfies: x·y*A(x,y) = ∑_n=-oo..+oo (-1)ⁿ * x^n*(n+1/2) * A(x,y)ⁿ, with coefficients T(n,k) of xⁿ*y^k in A(x,y) given as a triangle read by rows. A355360

Partial sums of A011757. A109770

Indices of primes in the tribonacci-like sequence A214827. A242324

a(n) = prime(n)*(prime(n+1) + 1). A123134

a(n) = n * ∑_d∣n binomial(d+3,4)/d. A343545