Properties of the Number 20631

Twenty Thousand Six Hundred Thirty-One

Basics

Value: 20630 → 20631 → 20632

Parity: odd

Prime: No

Previous Prime: 20627

Next Prime: 20639

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 3 × 13 × 23 ²

Divisors: 1, 3, 13, 23, 39, 69, 299, 529, 897, 1587

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101000010010111

Octal: 50227

Duodecimal: BB33

Hexadecimal: 5097

Square: 425638161

Square Root: 143.63495396316316

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 reducible integer partitions of n. A305563

T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing min(x(i,j),x(i-1,j)) in the j direction. A250812

Define a pair of sequences by p(0) = 0, q(0) = p(1) = q(1) = 1, q(n+1) = p(n)*q(n-1), p(n+1) = q(n+1) + q(n) for n > 0; then a(n) = q(n) and A064526(n) = p(n). A64183

The Berndt-type sequences number 7 for the argument 2*π/13. A217548

Numbers D such that D² = A³ + B⁴ + C⁵ has more than one solution in positive integers (A, B, C). A256603

Convolution of natural numbers >= 2 and natural numbers >= 3. A23545

a(n) = floor(exp(π*sqrt(n))). A60456

a(n) = (2·n - 7)*n². A15242

Number of (n+1)X(n+1) 0..2 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing min(x(i,j),x(i-1,j)) in the j direction. A250805

Number of (n+1) X (4+1) 0..2 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing min(x(i,j),x(i-1,j)) in the j direction. A250808