Properties of the Number 20751

Twenty Thousand Seven Hundred Fifty-One

Basics

Value: 20750 → 20751 → 20752

Parity: odd

Prime: No

Previous Prime: 20749

Next Prime: 20753

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 3 × 6917

Divisors: 1, 3, 6917, 20751

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101000100001111

Octal: 50417

Duodecimal: 10013

Hexadecimal: 510f

Square: 430604001

Square Root: 144.05207391773297

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

Semiprimes in A056108. A113527

a(n) = a(n-1)+floor(a(n-2)/4) with a(0)=3, a(1)=4. A182230

G.f. A(x) satisfies A(x) = 1 / ((1 - x) * (1 - 2·x * A(x⁴))). A390661

Numbers k for which A087808(σ(k)) is equal to A087808(2·k). A332446

Number of nX4 0..1 arrays with every element unequal to 0, 2, 3, 4 or 7 king-move adjacent elements, with upper left element zero. A304890

Pisot sequence T(6,9), a(n) = floor(a(n-1)²/a(n-2)). A20751