Properties of the Number 20265

Twenty Thousand Two Hundred Sixty-Five

Basics

Value: 20264 → 20265 → 20266

Parity: odd

Prime: No

Previous Prime: 20261

Next Prime: 20269

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 3 × 5 × 7 × 193

Divisors: 1, 3, 5, 7, 15, 21, 35, 105, 193, 579

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100111100101001

Octal: 47451

Duodecimal: B889

Hexadecimal: 4f29

Square: 410670225

Square Root: 142.3551895787435

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) is the (n+1)st (n+2)-gonal number. A64808

T(n,k)=Number of nXk 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 1 and 1 0 0 vertically. A207717

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

T(n,k)=Number of nXk 0..4 arrays with each element·equal to the number of its horizontal and vertical neighbors equal to 4,4,1,0,1 for x=0,1,2,3,4. A197529

Left edge of the triangle A045975. A204556

Triangle T(n,k) read by rows: the number of traceless symmetric binary n X n matrices with 2k one's and no all-1 2 X 2 submatrix. A352472

Values of e, the lesser key or generating number for Pythagorean triangles in which S (the odd short leg) and U (the hypotenuse) are twin primes. A51892

Least k such that decimal representation of k·n contains only digits 0 and 7. A96686

Triangle of coefficients of polynomials u(n,x) jointly generated with A209163; see the Formula section. A209162

Number of n X 3 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 1 and 1 0 0 vertically. A207712