Properties of the Number 2620

Two Thousand Six Hundred Twenty

Basics

Value: 2619 → 2620 → 2621

Parity: even

Prime: No

Previous Prime: 2617

Next Prime: 2621

Digit Sum: 10

Digital Root: 1

Palindrome: No

Factorization: 2 ² × 5 × 131

Divisors: 1, 2, 4, 5, 10, 20, 131, 262, 524, 655

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 101000111100

Octal: 5074

Duodecimal: 1624

Hexadecimal: a3c

Square: 6864400

Square Root: 51.18593556827891

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 self-inverse permutations on n letters, also known as involutions; number of standard Young tableaux with n cells. A85

Amicable numbers. A63990

Smaller of an amicable pair: (a,b) such that σ(a) = σ(b) = a+b, a < b. A2025

Amicable pairs. A259180

Sum of smallest parts of all partitions of n. A46746

Multiples of 20 containing a 20 in their decimal representation. A121040

Riordan array (1/(1 + 5·x + x²), x/(1 + 5·x + x²))^-1; inverse of Riordan array A123967. A125906

Number G(n,k) of set partitions of {1,...,n} into sets of size at most k; triangle G(n,k), n>=0, 0<=k<=n, read by rows. A229223

a(n) = n*(3·n + 11)/2. A59845

Table T(n,k) giving number of permutations of [1..n] with order dividing k, read by antidiagonals. A8307