Properties of the Number 220

Two Hundred Twenty

Basics

Value: 219 → 220 → 221

Parity: even

Prime: No

Previous Prime: 211

Next Prime: 223

Digit Sum: 4

Digital Root: 4

Palindrome: No

Factorization: 2 ² × 5 × 11

Divisors: 1, 2, 4, 5, 10, 11, 20, 22, 44, 55

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: Yes

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Representations

Binary: 11011100

Octal: 334

Duodecimal: 164

Hexadecimal: dc

Square: 48400

Square Root: 14.832396974191326

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

Tetrahedral (or triangular pyramidal) numbers: a(n) = C(n+2,3) = n*(n+1)*(n+2)/6. A292

Numbers k such that 10·R_k + 3 is prime, where R_k is the repunit (A002275) of length k. A56654

Abundant numbers (sum of divisors of m exceeds 2m). A5101

Numbers in base 3. A7089

Numbers in base 5. A7091

Numbers in base 4. A7090

Integers written in factorial base. A7623

a(n) = ∑_k=1..n k·floor(n/k); also ∑_k=1..n σ(k) where σ(n) = sum of divisors of n (A000203). A24916

Triangle of coefficients of Chebyshev's T(n,x) polynomials (powers of·in increasing order). A53120

Multiples of 4. A8586

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