Properties of the Number 2720

Two Thousand Seven Hundred Twenty

Basics

Value: 2719 → 2720 → 2721

Parity: even

Prime: No

Previous Prime: 2719

Next Prime: 2729

Digit Sum: 11

Digital Root: 2

Palindrome: No

Factorization: 2 ⁵ × 5 × 17

Divisors: 1, 2, 4, 5, 8, 10, 16, 17, 20, 32

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 101010100000

Octal: 5240

Duodecimal: 16A8

Hexadecimal: aa0

Square: 7398400

Square Root: 52.15361924162119

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

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

Numbers k that divide 3^k - 1. A67945

a(n) = n * σ(A003961(n)), where A003961 shifts the prime factorization of n one step towards larger primes, and σ is the sum of the divisors of n. A341528

Coordination sequence for 4-dimensional cubic lattice (points on surface of 4-dimensional cross-polytope). A8412

Triangle read by rows: T(n,k) = number of vertices in a "frame" of size n X k (see Comments in A331457 for definition). A332599

Total number of n-digit numbers requiring 4 positive biquadrates in their representation as sum of biquadrates. A186654

Triangle of coefficients T(n,k) of xⁿ*y^k in g.f. A(x,y) satisfying y = ∑_n=-oo..+oo (-1)ⁿ * xⁿ * (y·A(x,y) + x^n-1)ⁿ⁺¹. A359670

T(n,k)=Number of -k..k arrays x(0..n+1) of n+2 elements with zero sum and no two neighbors summing to zero. A199832

Number of ways of writing n as a sum of 5 squares. A132

Numbers with exactly 2 odd integers in their Collatz (or 3x+1) trajectory. A62052