ℕ atory
Play Now

Properties of the Number 20680

Twenty Thousand Six Hundred Eighty

Basics

Value: 20679 → 20680 → 20681

Parity: even

Prime: No

Previous Prime: 20663

Next Prime: 20681

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 2 3 × 5 × 11 × 47

Divisors: 1, 2, 4, 5, 8, 10, 11, 20, 22, 40

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101000011001000

Octal: 50310

Duodecimal: BB74

Hexadecimal: 50c8

Square: 427662400

Square Root: 143.8054240979804

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

Column 0 of square array A211970 (in which column 1 is A000041). A211971
Numbers m = concat(s,t) such that m = (σ(s)-s) * (σ(t)-t), where σ(x)-x is the sum of the aliquot parts of x. A253825
Number of regions formed inside a right triangle by the straight line segments mutually connecting all vertices and points on the two shorter edges whose positions on one edge equal the Farey series of order n while on the other they divide its length into n equal segments. A359975
E.g.f. A(x) = G(x)2/x where G(x) satisfies: G(G(x))2 = G(x)2 * G'(x) and G(x) is the g.f. of A179499. A179499
Triangle of coefficients of polynomials u(n,x) jointly generated with A209696; see the Formula section. A209695
The difference between the largest part and the smallest part summed over all those partitions of n in which every integer from the smallest part to the largest part occurs. A117471
Partial sums of the Dedekind psi2(k) function, for 1 <= k <= n. A321973
a(n) = ∑k=0..n BellPolynomial(n, k), row sums of A350263. A350264
Number of 4-cycles in the n-Pell graph. A364619
E.g.f. A(x) satisfies: A( cos(x) - exp(-x) ) = x. A205806