Properties of the Number 20618

Twenty Thousand Six Hundred Eighteen

Basics

Value: 20617 → 20618 → 20619

Parity: even

Prime: No

Previous Prime: 20611

Next Prime: 20627

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 2 × 13 ² × 61

Divisors: 1, 2, 13, 26, 61, 122, 169, 338, 793, 1586

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101000010001010

Octal: 50212

Duodecimal: BB22

Hexadecimal: 508a

Square: 425101924

Square Root: 143.58969322343438

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 different cuboids with volume (pq)ⁿ, where p,q are distinct prime numbers. A101427

Number of distinct products i·j*k·l for 1 <= i <= j <= k <= l <= n. A100437

Maximum value of the n-th difference of a permutation of 0..n. A130783

Group successively larger prime numbers so that the sum of the n-th group is a multiple of n. Sequence gives the group sum divided by n for the n-th group. A74131

a(n) = ∑_{k=0..floor(n/2)} k·binomial(n,k). A185251

Second elementary symmetric function of the first n terms of (2,2,3,3,4,4,5,5...). A203299

a(n) = ∑_{k = 0..n} k·binomial(2·n+1, k). A303602

Numbers k such that k*∑_d∣k 1/σ(d) is an integer. A69166

a(n) = A077704(n+1)/A077704(n). A77705

Zero followed by partial sums of A059100, starting at n=1. A145068