Properties of the Number -20908

Twenty Thousand Nine Hundred Eight

Basics

Value: -20909 → -20908 → -20907

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 2 ² × 5227

Divisors: 1, 2, 4, 5227, 10454, 20908

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -101000110101100

Octal: -50654

Duodecimal: -10124

Hexadecimal: -51ac

Square: 437144464

Square Root: 144.59598887936

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

Expansion of (ψ(x³) / ψ(x))² in powers of·where ψ() is a Ramanujan θ function. A217786

Sequence a(n) = 3 + 5·A001519(n+1) appearing in a certain three circle touching problem, together with A246638. A246639

Number of length 2+2 0..n arrays with the sum of second differences squared multiplied by some arrangement of +-1 equal to zero. A250321

Numbers whose base-12 representation has exactly 5 runs. A43654

Expansion of (1-x)^-1/(1-2·x-x²-2·x³). A77848

G.f. A(x) satisfies A(x) = 1+x·A(x)+x²*A(x)²+2·x³*A(x)³. A186239

Number of active (ON, black) cells at stage 2ⁿ-1 of the two-dimensional cellular automaton defined by "Rule 374", based on the 5-celled von Neumann neighborhood. A271458