Properties of the Number 20208

Twenty Thousand Two Hundred Eight

Basics

Value: 20207 → 20208 → 20209

Parity: even

Prime: No

Previous Prime: 20201

Next Prime: 20219

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 2 ⁴ × 3 × 421

Divisors: 1, 2, 3, 4, 6, 8, 12, 16, 24, 48

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100111011110000

Octal: 47360

Duodecimal: B840

Hexadecimal: 4ef0

Square: 408363264

Square Root: 142.15484515133488

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)=Number of nXk 0..3 arrays with the row and column sums nondecreasing. A202581

Expansion of 1/(1+8·x*c(x)), c(x) the g.f. of Catalan numbers A000108. A126985

Row sums of A163233 and A163235. A163242

Triangle of coefficients of polynomials v(n,x) jointly generated with A209133; see the Formula section. A209134

Number of productions of a certain "divide-and-conquer" context-free grammar in Chomsky normal form that generates all permutations of n symbols. A92285

Numbers k such that 4·R_k + 5 is prime, where R_k = 11...1 is the repunit (A002275) of length k. A99414

n-th central term of triangle A118032 divided by n+1 for n>=0, where the matrix square of A118032 forms a diagonal bisection of A118032. A118039

a(n) = a(n-1) + a(n-2) + a(n-3) - a(n-4) with a(0)=0, a(1)=1, a(2)=2 and a(3)=3. A135431

θ series of direct sum of 2 copies of f.c.c. lattice. A8663

Number of 6-step left-handed knight's tours (moves only out two, left one) on an n X n board summed over all starting positions. A187176