Properties of the Number 20930

Twenty Thousand Nine Hundred Thirty

Basics

Value: 20929 → 20930 → 20931

Parity: even

Prime: No

Previous Prime: 20929

Next Prime: 20939

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 2 × 5 × 7 × 13 × 23

Divisors: 1, 2, 5, 7, 10, 13, 14, 23, 26, 35

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101000111000010

Octal: 50702

Duodecimal: 10142

Hexadecimal: 51c2

Square: 438064900

Square Root: 144.67204291085406

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

When expressed in base 2 and then interpreted in base 7, is a multiple of the original number. A62848

E.g.f. satisfies: A(x - Integral A(x) dx) = x + Integral A(x) dx. A277403

a(n) = n*(n + 11)*(n + 22)*(n + 33)/24. A264448

a(n) = 7·binomial(4·n + 7, n)/(4·n + 7). A233658

a(n) = ∑_k=1..n k² * floor(n/k)². A350123

Numbers such that the sum of the largest and the smallest prime divisor equals the sum of the other distinct prime divisors. A199745

Triangle read by rows: T(n,m) = number of m-block proper covers (without empty blocks and without multiple blocks) of a labeled n-set (n>=2, 2<=m<=2ⁿ-2). A95421

Antidiagonal sums of triangle A124428. A124429

Coefficient of·in the reduction by x² -> x+1 of the polynomial p(n,x) defined at Comments. A192976

Squarefree numbers m such that the equation x*(x+1)*(x+2) = m·y² has more than one solution (x,y) with x>0 and y>0. A335715