Properties of the Number 25820

Twenty-Five Thousand Eight Hundred Twenty

Basics

Value: 25819 → 25820 → 25821

Parity: even

Prime: No

Previous Prime: 25819

Next Prime: 25841

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 2 ² × 5 × 1291

Divisors: 1, 2, 4, 5, 10, 20, 1291, 2582, 5164, 6455

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 110010011011100

Octal: 62334

Duodecimal: 12B38

Hexadecimal: 64dc

Square: 666672400

Square Root: 160.68602926203636

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 different strings of length n obtained from "abcd" by iteratively duplicating any substring. A137744

Sum of the largest parts in the partitions of n into 7 squarefree parts. A308960

Numbers whose square starts with 4 identical digits. A132391

1-Euler triangle. A188587

a(n) = a(n-1) + a(n-3) + 2·a(n-5) - a(n-8) - a(n-10), n > 10. A293344

∏_n>=1 1 / (1 - a(n)*xⁿ) = 1 + ∑_n>=1 φ(n)*xⁿ, where φ = A000010. A353948

Sum of the sizes of the ninth blocks in all set partitions of {1,2,...,n}. A270501

Numbers whose square starts with exactly 4 identical digits. A346940

Number of triangles in an n X n grid of squares with diagonals. A100583

Partial sums of A160410. A160799