Properties of the Number 20290

Twenty Thousand Two Hundred Ninety

Basics

Value: 20289 → 20290 → 20291

Parity: even

Prime: No

Previous Prime: 20287

Next Prime: 20297

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 2 × 5 × 2029

Divisors: 1, 2, 5, 10, 2029, 4058, 10145, 20290

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8509 Try Today's Challenge

Representations

Binary: 100111101000010

Octal: 47502

Duodecimal: B8AA

Hexadecimal: 4f42

Square: 411684100

Square Root: 142.44297104455524

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

T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with column and row pair sums b(i,j)=a(i,j)+a(i,j-1) and c(i,j)=a(i,j)+a(i-1,j) nondecreasing in column and row directions, respectively. A203728

a(n) = ∑_k=0..n binomial(n, floor(k/2))*3^n-k. A127359

Number of partitions p = [x(1), ..., x(k)], where x(1) >= x(2) >= ... >= x(k), of n such that max(x(i) - x(i-1)) is not a part of p. A241736

a(n) = n-th π-based antiderivative of 1. A258975

Expansion of ∏_k>=1 B(x^k), where B(x) is the g.f. of A111374. A327851

Numbers k such that the continued fraction for sqrt(k) has period 57. A20396

Number of (n+1) X 4 0..2 arrays with column and row pair sums b(i,j)=a(i,j)+a(i,j-1) and c(i,j)=a(i,j)+a(i-1,j) nondecreasing in column and row directions, respectively. A203723

Number of (n+1)X5 0..2 arrays with column and row pair sums b(i,j)=a(i,j)+a(i,j-1) and c(i,j)=a(i,j)+a(i-1,j) nondecreasing in column and row directions, respectively. A203724

Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite DAC = Dachiardite Na5[Al5Si19O48].12H2O starting with a T3 atom. A19104

Number of 2-connected outerplanar graphs on n labeled nodes. A97999