Properties of the Number 20550

Twenty Thousand Five Hundred Fifty

Basics

Value: 20549 → 20550 → 20551

Parity: even

Prime: No

Previous Prime: 20549

Next Prime: 20551

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 2 × 3 × 5 ² × 137

Divisors: 1, 2, 3, 5, 6, 10, 15, 25, 30, 50

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101000001000110

Octal: 50106

Duodecimal: BA86

Hexadecimal: 5046

Square: 422302500

Square Root: 143.35271186831451

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

Third differences of fifth powers (A000584). A101096

T(n,k)=Number of nXk 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 0 1 0 vertically. A207426

T(n,k)=Number of nXk 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 1 0 0 vertically. A207741

Number of nonnegative solutions of x1² + x2² + ... + x10² = n. A45852

Numbers n such that for some m, A166133(m)=n, A166133(m+1)=n²-1, in increasing order. A256407

a(n) = 60·n² + 180·n + 150. A69477

a(n) is a non-palindromic composite located between twin primes whose reverse, which is less than it, is also located between twin primes. A103741

Numbers n such that for some m, A166133(m)=n, A166133(m+1)=n²-1, in order of increasing m. A256406

Triangle T(n,k) read by rows, where o.g.f. for T(n,k) is n!*∑_k=0..n (1+x)^n-k/k!. A73474

Number of 3Xn 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 0 1 0 vertically. A207427