Properties of the Number 20997

Twenty Thousand Nine Hundred Ninety-Seven

Basics

Value: 20996 → 20997 → 20998

Parity: odd

Prime: No

Previous Prime: 20983

Next Prime: 21001

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 2333

Divisors: 1, 3, 9, 2333, 6999, 20997

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101001000000101

Octal: 51005

Duodecimal: 10199

Hexadecimal: 5205

Square: 440874009

Square Root: 144.90341610879986

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

X-toothpick sequence on Z³ lattice (see Comments for precise definition). A160170

Numbers k such that A(k+1) = A(k) + 1, where A() = A005101() are the abundant numbers. A169822

a(n) is the number of edges formed by n-secting the angles of a nonagon (enneagon). A335783

Number of asymmetric monoids (semigroups with identity) of order n. A58130

L-th order palindromes with L > 2. A89381

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 324", based on the 5-celled von Neumann neighborhood. A271257

Numbers n such that the sum of the digits of Lucas(n) is n. A20997