Properties of the Number 20693

Twenty Thousand Six Hundred Ninety-Three

Basics

Value: 20692 → 20693 → 20694

Parity: odd

Prime: Yes

Previous Prime: 20681

Next Prime: 20707

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 20693

Divisors: 1, 20693

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101000011010101

Octal: 50325

Duodecimal: BB85

Hexadecimal: 50d5

Square: 428200249

Square Root: 143.85061696079026

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

Fundamental discriminants d uniquely characterizing all complex biquadratic fields Q(sqrt(-3),sqrt(d)) which have 3-class group of type (3,3) and second 3-class group isomorphic to SmallGroup(729,34). A250241

Primes p of the form 4·k+1 for which s=26 is the least positive integer such that s·p-(floor(sqrt(s·p)))² is a square. A145050

Number of inequivalent (mod D₄) ways to place 2 nonattacking knights on an n X n board. A243717

The number of patterns of non-papaya words. A165610

Primes such that the sum of the factorials of the digits is a perfect square. A52279

Primes p such that q = 4p² + 1 and r = 4q² + 1 are also prime. A122424

Primes p such that continued fraction of (1 + sqrt(p))/2 has period 11: primes in A146335. A146356

Primes 8k + 5 at the end of the maximal gaps in A269513. A269515

Incorrect duplicate of A297408. A7355

Triangle T(n,k) = binomial(n,k) + A176490(n,k) - 1 read along rows 0<=k<=n. A176491