Properties of the Number -2220

Two Hundred Twenty

Basics

Value: -2221 → -2220 → -2219

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 6

Digital Root: 6

Palindrome: No

Factorization: 2 ² × 3 × 5 × 37

Divisors: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -100010101100

Octal: -4254

Duodecimal: -1350

Hexadecimal: -8ac

Square: 4928400

Square Root: 47.11687595755899

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

T(n, k) is the coefficient of z^k in the numerator of the polynomial part of zⁿ*exp(-n·s), where s = hypergeom([1, 1, 3/2], [2, 5/2], 1/z²)/(6z²); related to Chebyshev's quadrature. Triangle read by rows, T(n,k) for 0 <= k <= n. A101270

Irregular triangle read by rows: row n gives numerators of coefficients of polynomials arising from Chebyshev quadrature. A324123

McKay-Thompson series of class 18f for the Monster group. A58544

Matrix inverse of A008278, which is the reflected triangle of the Stirling numbers of 2nd kind. A106342

Column 0 of triangle A106342, which is the matrix inverse of the triangle A008278 of Stirling numbers of 2nd kind. A106343

Alternating sum of 9-gonal (or decagonal) pyramidal numbers. A269440

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

Triangular matrix T, read by rows, where row n of T equals row (n-1) of Tⁿ⁺¹ with an appended '1'. A121412

Numbers k such that k² divides 11^k - 1. A127092

Generalized 23-gonal (or icositrigonal) numbers: m*(21·m - 19)/2 with m = 0, +1, -1, +2, -2, +3, -3, ... A303303