Properties of the Number 20625

Twenty Thousand Six Hundred Twenty-Five

Basics

Value: 20624 → 20625 → 20626

Parity: odd

Prime: No

Previous Prime: 20611

Next Prime: 20627

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 3 × 5 ⁴ × 11

Divisors: 1, 3, 5, 11, 15, 25, 33, 55, 75, 125

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101000010010001

Octal: 50221

Duodecimal: BB29

Hexadecimal: 5091

Square: 425390625

Square Root: 143.61406616345073

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

Numbers k such that the k-th composition in standard order is an alternating permutation of {1..k} for some k. A349051

Numbers k such that 4·k-1, 8·k-1, 16·k-1 and 32·k-1 are all primes. A101794

T(n,k)=Number of (n+4)X(k+4) binary arrays with every 1 having exactly three king-move neighbors equal to 1 but with no 2X2 blocks of 1s. A183465

Integers k such that k = Sum k/(p_i + j), where p_i are the prime factors of k (with multiplicity). Case j = 1. A380889

Numbers m such that the smallest digit in the decimal expansion of 1/m is 4, ignoring leading and trailing 0's. A352158

a(n) = exp(-1/5) * ∑_k>=0 (5·k - 1)ⁿ / (5^k * k!). A337041

Number of 2 X 2 matrices having all elements in {0,1,...,n} and determinant = 0 (mod 3). A211033

Expansion of ∏_k>0 1/(1 + x^k)^k·5. A279932

Decimal representation of the diagonal from the corner to the origin of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 457", based on the 5-celled von Neumann neighborhood. A288399

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