Properties of the Number 20673

Twenty Thousand Six Hundred Seventy-Three

Basics

Value: 20672 → 20673 → 20674

Parity: odd

Prime: No

Previous Prime: 20663

Next Prime: 20681

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 2297

Divisors: 1, 3, 9, 2297, 6891, 20673

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101000011000001

Octal: 50301

Duodecimal: BB69

Hexadecimal: 50c1

Square: 427372929

Square Root: 143.7810835958611

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 labeled connected graphs with n edges (the vertices are {1,2,...,k} for some k). A322137

Numbers k such that k | 11^k + 10^k + 9^k + 8^k + 7^k + 6^k + 5^k + 4^k + 3^k + 2^k + 1^k. A57292

L.g.f.: -log( ∑_n=-oo..+oo (-p)ⁿ * (p·x)^n² ) = ∑_n>=1 a(n) * xⁿ/n, where p = sqrt(2). A337948

Expansion of g.f. A(x) satisfying A(x)³ = A( x³/(1 - 3·x)³ ). A361763

a(n) is the number of labeled connected planar graphs with n edges. A291842

McKay-Thompson series of class 30d for Monster. A58625

Sum of n-th powers of the roots of x³ + 8·x² + 5·x - 1. A322461

Numbers of form x² + 10 y². A20673

Expansion of g.f. A(x) satisfying A(x)³ = A( x³/(1 - 3·x)³ ) / (1 - 3·x). A361762