Properties of the Number -2620

Six Hundred Twenty

Basics

Value: -2621 → -2620 → -2619

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

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

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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

∏_k>=1 1/(1 - x^k)^a(k) = 1 + 5x. A38066

Expansion of ∑_k>0 x^2·k/(1+x^k)⁴. A363598

Square array A(n,k), n >= 1, k >= 1, read by antidiagonals downwards, where A(n,k) = -(1/n) * ∑_d∣n μ(n/d) * (-k)^d. A383011

Sum of the n-th antidiagonal in the triangle A192011. A198862

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