Properties of the Number -20180

Twenty Thousand One Hundred Eighty

Basics

Value: -20181 → -20180 → -20179

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 11

Digital Root: 2

Palindrome: No

Factorization: 2 ² × 5 × 1009

Divisors: 1, 2, 4, 5, 10, 20, 1009, 2018, 4036, 5045

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: -100111011010100

Octal: -47324

Duodecimal: -B818

Hexadecimal: -4ed4

Square: 407232400

Square Root: 142.0563268566381

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

Triangle of numbers arising in enumeration of walks on cubic lattice. A52179

a(n) is the concatenation of n and 9n. A9474

Numbers n such that there are precisely 15 groups of orders n and n + 1. A295995

Fibonacci iteration starting with (1, a(n)) leads to a "nine digits anagram". A34587

G.f. satisfies: A(x) = exp( ∑_n>=1 (∑_k=0..n C(n,k)³*A(x)^k) * xⁿ/n ). A192131

Expansion of 2·x²*(7+14·x+4·x²)/((1+x-x²)*(1-2·x-10·x²-6·x³)). A120714

Expansion of 1/(theta₃(q) * theta₃(q²) * theta₃(q³)), where theta₃() is the Jacobi θ function. A320070

a(1)=1, a(n) = a(n-1) + n⁵ if n odd, a(n) = a(n-1) + n⁰ if n is even. A140162

a(n) = 961·n - 1. A158412

Interprimes which are of the form s·prime, s=20. A75295