Properties of the Number 20676

Twenty Thousand Six Hundred Seventy-Six

Basics

Value: 20675 → 20676 → 20677

Parity: even

Prime: No

Previous Prime: 20663

Next Prime: 20681

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 2 ² × 3 × 1723

Divisors: 1, 2, 3, 4, 6, 12, 1723, 3446, 5169, 6892

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101000011000100

Octal: 50304

Duodecimal: BB70

Hexadecimal: 50c4

Square: 427496976

Square Root: 143.79151574414954

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 nXk binary arrays with row sums nondecreasing and columns lexicographically nondecreasing. A267245

Numbers k such that the k-th composition in standard order is an alternating permutation of {1..k} for some k. A349051

53 'Reverse and Add' steps are needed to reach a palindrome. A65320

Expansion of e.g.f. (1+x)^1/(1-log(1+x)). A88819

Triangle read by rows: Each row is constructed by forming the partial sums of the previous row, reading from the right and at every third row repeating the final term. A99961

a(n) = Sum_k k·A333274(n,k). A333276

a(n) = C(n+2,3) + 2·C(n,2) + 2*(n-2). A34857

E.g.f.: exp(exp(sinh(x))-1)-1. A53488

a(n) = 4·n⁵ + 10·n⁴ + 13·n³ + 11·n² + 5·n + 1. A94201

Sequence of the next-to-last entries in the rows of A099961. A99963