Properties of the Number 20091

Twenty Thousand Ninety-One

Basics

Value: 20090 → 20091 → 20092

Parity: odd

Prime: No

Previous Prime: 20089

Next Prime: 20101

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 3 × 37 × 181

Divisors: 1, 3, 37, 111, 181, 543, 6697, 20091

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100111001111011

Octal: 47173

Duodecimal: B763

Hexadecimal: 4e7b

Square: 403648281

Square Root: 141.742724681022

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

3 times 12-gonal (or dodecagonal) numbers: a(n) = 3·n*(5·n-4). A153448

Numbers k such that 6·k+5, 6·k+11, 6·k+17, 6·k+23 are consecutive primes. A90836

Numbers k for which rank of the elliptic curve y²=x³-k·x is 4. A309034

Pair the odd numbers such that the k-th pair is (r, r+2k) where r is the smallest odd number not included earlier: (1, 3), (5, 9), (7, 13), (11, 19), (15, 25), (17, 29), (21, 35), (23, 39), (27, 45), ... This is the sequence of the product of the members of pairs. A75320

a(n) = binomial(2·c-1, c-1) (mod c³), where c is the n-th composite. A244214

Anagrasum integers: integers N that exactly reproduce their set of digits when we form the set of sums of pairs of adjacent digits. A296521

Triangle read by rows of operator ordering coefficients corresponding to the Legendre polynomials L_n(x). A225694

Base-9 palindromes that start with 3. A43030

Numbers n for which there are exactly ten k such that n = k + reverse(k). A72434

Least number beginning with n such that every concatenation is a prime. A90506