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Properties of the Number 20957

Twenty Thousand Nine Hundred Fifty-Seven

Basics

Value: 20956 → 20957 → 20958

Parity: odd

Prime: No

Previous Prime: 20947

Next Prime: 20959

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 19 × 1103

Divisors: 1, 19, 1103, 20957

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101000111011101

Octal: 50735

Duodecimal: 10165

Hexadecimal: 51dd

Square: 439195849

Square Root: 144.7653273404927

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

Principal diagonal of the convolution array A213573. A213574
Linear recursion relative of Shallit sequence S(2,6). A14010
Define the Shallit sequence S(a0,a1) by an+2 is the least integer > an+12/an for n >= 0. This is S(2,6). A18906
Numbers such that the sum of the factorials of the digits of the fifth power is a square. A126078
a(n) = 676·n + 1. A158386
a(n) = 3·a(n-1)+a(n-2)-a(n-3)+a(n-6)-a(n-7)+a(n-10)-a(n-11). A22041
Number of n X 3 arrays of the minimum value of corresponding elements and their horizontal, vertical, diagonal or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and columns, 0..1 n X 3 array. A219349
a(n) = 31·n2 + 1. A247155
Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 637", based on the 5-celled von Neumann neighborhood. A273306
Magic numbers of anti-Mackay icosahedra. A277131