Properties of the Number 20775

Twenty Thousand Seven Hundred Seventy-Five

Basics

Value: 20774 → 20775 → 20776

Parity: odd

Prime: No

Previous Prime: 20773

Next Prime: 20789

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 3 × 5 ² × 277

Divisors: 1, 3, 5, 15, 25, 75, 277, 831, 1385, 4155

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101000100100111

Octal: 50447

Duodecimal: 10033

Hexadecimal: 5127

Square: 431600625

Square Root: 144.13535305399574

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

Sums of 7 distinct powers of 3. A38469

A diagonal of the triangle A128080 of coefficients of q in the q-analog of the odd double factorials: a(n) = A128080(n+1,n). A128082

Expansion of ∏_k>=1 (1 + (x*(1 - x))^k). A307501

a(n) = ∑_{1 <= x₁ <= x₂ <= x₃ <= x₄ <= n} gcd(x₁, x₂, x₃ , x₄, n). A343518

Number of nX4 0..1 arrays with every element equal to 0, 2, 3, 5 or 8 king-move adjacent elements, with upper left element zero. A298723

a(n) is the number of regions into which three-dimensional Euclidean space is divided by n-1 planes parallel to each face of a regular tetrahedron with edge length n, dividing the edges into unit segments. A364401

a(1) = 1; for n>1, a(n) = the smallest number p > a(n-1) such that (a(n-1)+p)/2 is a cube. A126950

Number of reduced words of length n in the Weyl group A₄₉. A161694

Decimal expansion of 1/sqrt(18). A20775

T(n,k)=Number of nXk 0..1 arrays with every element equal to 0, 2, 3, 5 or 8 king-move adjacent elements, with upper left element zero. A298727