Properties of the Number 20756

Twenty Thousand Seven Hundred Fifty-Six

Basics

Value: 20755 → 20756 → 20757

Parity: even

Prime: No

Previous Prime: 20753

Next Prime: 20759

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 2 ² × 5189

Divisors: 1, 2, 4, 5189, 10378, 20756

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101000100010100

Octal: 50424

Duodecimal: 10018

Hexadecimal: 5114

Square: 430811536

Square Root: 144.06942770761603

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 regions formed inside square by diagonals and the segments joining the vertices to the points dividing the sides into n equal length segments. A108914

Expansion of ∏_k>=1 1/(1-x^k+2)^k. A263358

Triangle read by rows, a generalization of the Eulerian numbers based on Nielsen's generalized polylogarithm (case m = 2). A142249

Sum of the first n twin prime pairs. A86169

Number of partitions of n with difference -2 between the number of odd parts and the number of even parts, both counted without multiplicity. A242690

Column 4 of A142249. A293562

Number of binary strings of length n with equal numbers of 00001 and 11000 substrings. A164208

Number of (n+1)X(6+1) 0..2 arrays with the upper median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one. A237635

Number of walks within N³ (the first octant of Z³) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, -1, 1), (-1, 1, 0), (0, 1, 1), (1, 0, -1)}. A148441

Numbers that are the sum of two triangular numbers. A20756