Properties of the Number 20688

Twenty Thousand Six Hundred Eighty-Eight

Basics

Value: 20687 → 20688 → 20689

Parity: even

Prime: No

Previous Prime: 20681

Next Prime: 20693

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 2 ⁴ × 3 × 431

Divisors: 1, 2, 3, 4, 6, 8, 12, 16, 24, 48

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101000011010000

Octal: 50320

Duodecimal: BB80

Hexadecimal: 50d0

Square: 427993344

Square Root: 143.83323677092162

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 binary toroidal necklaces of size n. A323859

Number of integer partitions of n whose parts minus 1 are relatively prime. A328170

Total area of the shadows of the three views of a three-dimensional version of the shell model of partitions with n shells. A210970

a(n) = C(2,n) δ C(0,n). A147721

Number of partitions p of n such that 2*(number of even numbers in p) >= (number of odd numbers in p). A241654

Number of solid partitions of n supported on graph of cube. A3404

Number of 2 X 2 matrices having all elements in {-n,...n} and determinant 3. A209986

Number of unlabeled trees covering 2n nodes, n+1 of which are leaves. A358107

Numbers missing from A001033 despite satisfying the necessary congruence conditions (see comments). A274470

Number of trees with n nodes and 10 leaves. A55297