Properties of the Number 20254

Twenty Thousand Two Hundred Fifty-Four

Basics

Value: 20253 → 20254 → 20255

Parity: even

Prime: No

Previous Prime: 20249

Next Prime: 20261

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 2 × 13 × 19 × 41

Divisors: 1, 2, 13, 19, 26, 38, 41, 82, 247, 494

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100111100011110

Octal: 47436

Duodecimal: B87A

Hexadecimal: 4f1e

Square: 410224516

Square Root: 142.3165485809714

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

Molien series for cyclic group of order 5. A8646

Array read by antidiagonals: T(n,k) = number of nonequivalent dissections of a polygon into n k-gons by nonintersecting diagonals up to rotation (k >= 3). A295224

a(n) = floor(C(n,4)/5). A11795

a(n) = ∑_k=1..n k^floor((n-k)/k). A344551

Number of oriented polyominoes with n heptagonal cells of the hyperbolic regular tiling with Schläfli symbol {7,oo}. A389561

Schoenheim bound L₁(n,5,4). A36832

a(n) = binomial(n+4,4)*gcd(n,5)/5. A234042

a(n) = T(n,5), array T as in A051168; a count of Lyndon words; aperiodic necklaces with 5 black beads and n-5 white beads. A51170

Principal diagonal of the convolution array A213781. A213782

Squarefree numbers k such that k² is abundant, and d² is nonabundant for any proper divisor d of k. A381741