Properties of the Number 19906

Nineteen Thousand Nine Hundred Six

Basics

Value: 19905 → 19906 → 19907

Parity: even

Prime: No

Previous Prime: 19891

Next Prime: 19913

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 2 × 37 × 269

Divisors: 1, 2, 37, 74, 269, 538, 9953, 19906

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100110111000010

Octal: 46702

Duodecimal: B62A

Hexadecimal: 4dc2

Square: 396248836

Square Root: 141.088624630053

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

G.f. satisfies: A(x) = A(x²)² + x·A(x²)⁴. A174513

Number of (n+1) X 3 0..2 matrices with each 2 X 2 subblock idempotent. A224670

Number of (n+1) X (2+1) 0..2 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 2 (constant-stress 1 X 1 tilings). A234260

a(n) = number of isogeny classes of p-divisible groups of abelian varieties of dimension n over an algebraically closed field of characteristic p (for any fixed prime p). A361721

Numbers k such that (13·10^k + 161)/3 is prime. A284779

T(n,k) is the number of (n+1) X (k+1) 0..2 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 2 (constant-stress 1 X 1 tilings). A234266

G.f. A(x) satisfies: 0 = [x^n-1] 1 / A(x)^n²-n+1 for n>2. A303563

Decimal expansion of tangent of 8 degrees. A19906

Number of (n+1)X(5+1) arrays of permutations of 0..n·6+5 with each element having directed index change 0,0 0,1 1,0 or -1,-2. A264282