Properties of the Number -20251

Twenty Thousand Two Hundred Fifty-One

Basics

Value: -20252 → -20251 → -20250

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 10

Digital Root: 1

Palindrome: No

Factorization: 7 × 11 × 263

Divisors: 1, 7, 11, 77, 263, 1841, 2893, 20251

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

5184 Try Today's Challenge

Representations

Binary: -100111100011011

Octal: -47433

Duodecimal: -B877

Hexadecimal: -4f1b

Square: 410103001

Square Root: 142.30600830604448

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

a(n) = ∑_{k = 0..n} (-1)^n+k*binomial(n, k)*binomial(n+k, k)*A108625(n, n-k). A376459

Numbers k such that k¹⁴ == 1 (mod 15³). A56087

Number of regions formed when n equally spaced points are placed around a circle and all pairs of points are joined by an interior arc whose radius equals the circle's radius. A371253

Number of effective multiple alignments of three equal-length sequences. A124435

Square array T(n,k), n >= 0, k >= 0, read by antidiagonals, where T(n,k) = ∑_j=0..n (-1)^n-j * multinomial(n+(k-1)*j; n-j, {j}^k). A336169

Numbers k such that the sum of the digits of k² is 10. Multiples of 10 are omitted. A135027

Greatest integer k such that k/2ⁿ < 1/φ, where φ = (1+sqrt(5))/2 = golden ratio. A293322

15-gonal (or pentadecagonal) pyramidal numbers: a(n) = n*(n+1)*(13·n-10)/6. A177890

Numbers k such that the sum of digits of k² is 10. A262713

Expansion of 1/((1-3·x)*(1-5·x)*(1-9·x)). A17897