Properties of the Number 20228

Twenty Thousand Two Hundred Twenty-Eight

Basics

Value: 20227 → 20228 → 20229

Parity: even

Prime: No

Previous Prime: 20219

Next Prime: 20231

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 2 ² × 13 × 389

Divisors: 1, 2, 4, 13, 26, 52, 389, 778, 1556, 5057

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100111100000100

Octal: 47404

Duodecimal: B858

Hexadecimal: 4f04

Square: 409171984

Square Root: 142.22517358048822

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

Number of subsets of {1, 2, ..., n} such that no member is a sum of distinct other members. A151897

Numbers n such that Bernoulli number B_n has denominator 1590. A272140

T(n,k)=Number of (n+1)X(k+1) 0..1 arrays with no element having a strict majority of its horizontal and antidiagonal neighbors equal to one. A231997

T(n,k)=Number of nXk 0..3 arrays with row sums equal and column sums unequal to adjacent columns. A203031

Numbers n for which there are exactly six k such that n = k + (product of nonzero digits of k). A96927

Number of partitions of 5n such that cn(1,5) = cn(4,5) < cn(0,5) <= cn(2,5) = cn(3,5). A36890

Indices n such that the 3 X 3 matrix with components (row by row) prime(n+k), 0 <= k <= 8, has zero determinant. A117345

Expansion of ∏_{1 <= i <= j <= k} 1/(1 - x^i·j*k). A321360

Number of regions in a "cross" of width 3 and height n (see Comments for definition). A331455

Numbers n such that n!10+1 is prime. A204656