Properties of the Number 56820

Fifty-Six Thousand Eight Hundred Twenty

Basics

Value: 56819 → 56820 → 56821

Parity: even

Prime: No

Previous Prime: 56813

Next Prime: 56821

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 2 ² × 3 × 5 × 947

Divisors: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1101110111110100

Octal: 156764

Duodecimal: 28A70

Hexadecimal: ddf4

Square: 3228512400

Square Root: 238.36946113124475

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 active (ON, black) cells at stage 2ⁿ-1 of the two-dimensional cellular automaton defined by "Rule 113", based on the 5-celled von Neumann neighborhood. A270178

Triangle, read by rows, where row n equals the coefficients of y^k in R_n-1(y+y²) for k=2..n, where R_n(y) is the n-th row polynomial in y for n>=2 with R₂(y)=y². A187115

G.f. A(x) satisfies: [x^m+2] A(F^m(x)) = 0 for m>0 where F^m(x) denotes the m-th iteration of F(x) = x+x² with F⁰(x)=x. A187119

Euler totient function of Cullen numbers (A002064), n·2ⁿ +1. A56820