Properties of the Number 20280

Twenty Thousand Two Hundred Eighty

Basics

Value: 20279 → 20280 → 20281

Parity: even

Prime: No

Previous Prime: 20269

Next Prime: 20287

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 2 ³ × 3 × 5 × 13 ²

Divisors: 1, 2, 3, 4, 5, 6, 8, 10, 12, 13

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 100111100111000

Octal: 47470

Duodecimal: B8A0

Hexadecimal: 4f38

Square: 411278400

Square Root: 142.40786495134319

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

Partial sums of A299255. A299261

Triangular array read by rows: T(n, k) = binomial(n, k) * A000129(n - k) for 0 <= k < n. A367211

Numbers k that, when expressed in base 5 and then interpreted in base 8, give a multiple of k. A62930

Triangle T(m,k) read by rows, where T(m,k) is the number of ways in which 1<=k<=m positions can be picked in an m X m square grid such that the picked positions have a line symmetry but no point symmetry. A292156

a(n) = ∑_0<j<n n³-j³. A206808

a(n) = 30·n². A244636

If F is the Fermat point of a triangle ABC with A < B < C < 2*π/3, where AB, BC, CA, FA, FB and FC are all positive integers, then, this sequence gives the sum FA + FB + FC when gcd(a, b, c) = A351477(n). A351476

a(n) = coefficient of xⁿ in A(x) such that: 0 = ∑_n=-oo..+oo x^6·n * (xⁿ - 2·A(x))^7·n+1. A358956

Areas A of the triangles such that A, the sides and the three altitudes are integers. A210643

∑_{i for which n - i*(i-1)/2 >= 0} binomial (n - i*(i-1)/2, i). A63978