Properties of the Number 20925

Twenty Thousand Nine Hundred Twenty-Five

Basics

Value: 20924 → 20925 → 20926

Parity: odd

Prime: No

Previous Prime: 20921

Next Prime: 20929

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ³ × 5 ² × 31

Divisors: 1, 3, 5, 9, 15, 25, 27, 31, 45, 75

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101000110111101

Octal: 50675

Duodecimal: 10139

Hexadecimal: 51bd

Square: 437855625

Square Root: 144.65476141489432

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

Solution to the non-squashing boxes problem (version 1). A89054

Irregular table read by rows: T(n,k) is the number of k-gons, k>=2, among all distinct circles that can be constructed from the 3 vertices and the equally spaced 3·n points placed on the sides of an equilateral triangle, using only a compass. A372617

Triangle read by rows: T(n,k) is the number of ternary trees with n edges and having k vertices of outdegree 2 (n >= 0, k >= 0). A120982

Number of ternary trees with n edges and having no vertices of degree 2. A ternary tree is a rooted tree in which each vertex has at most three children and each child of a vertex is designated as its left or middle or right child. A120985

Odd numbers k that divide φ(k)*σ(k). A15706

Row sums of triangle A159924. A159925

Expansion of (1-4·x+7·x²-5·x³+4·x⁴-6·x⁵+21·x⁶+18·x⁷-5·x⁸)/(1-x)⁵. A212393

Number of partitions p of n such that max(p)-min(p) = 7. A218570

Numbers whose numerator and denominator of the harmonic mean of their divisors are both 5-smooth numbers. A348868

Odd binary Niven numbers (A144302) k such that k/wt(k) is also an odd binary Niven number, where wt(k) = A000120(k) is the binary weight of k. A376618