Properties of the Number 20558

Twenty Thousand Five Hundred Fifty-Eight

Basics

Value: 20557 → 20558 → 20559

Parity: even

Prime: No

Previous Prime: 20551

Next Prime: 20563

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 2 × 19 × 541

Divisors: 1, 2, 19, 38, 541, 1082, 10279, 20558

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 101000001001110

Octal: 50116

Duodecimal: BA92

Hexadecimal: 504e

Square: 422631364

Square Root: 143.38061235745926

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 integer partitions of n where the parts have the same median as the distinct parts. A360245

T(n,k)=Number of (n+2)X(k+2) 0..2 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 1 or 4. A252293

Expansion of ∏_k>=1 (1 + x^k²)^k². A291649

Number of complementary pairs of `homogenized' N-free graphs with n nodes. A241156

Number of (n+2)X(3+2) 0..2 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 1 or 4. A252288

Number of (n+2)X(4+2) 0..2 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 1 or 4. A252289

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 451", based on the 5-celled von Neumann neighborhood. A272258

Number of ordered multigraphs on n labeled edges (without loops). A20558

Number of 7Xn 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 0 1 0 vertically. A207247