Properties of the Number 20949

Twenty Thousand Nine Hundred Forty-Nine

Basics

Value: 20948 → 20949 → 20950

Parity: odd

Prime: No

Previous Prime: 20947

Next Prime: 20959

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 3 × 6983

Divisors: 1, 3, 6983, 20949

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101000111010101

Octal: 50725

Duodecimal: 10159

Hexadecimal: 51d5

Square: 438860601

Square Root: 144.73769377739856

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

Number of subsets of {1..n} whose harmonic mean is an integer. A339453

a(n) = 997·n + 1009. A100776

G.f.: ∑_n>=0 xⁿ / (1-x)^σ(n). A227237

Number of compositions of n such that the smallest part has multiplicity five. A241865

Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 96. A31594

Least k such that A(k) = n, where A( ) is sequence A020945. A20949