Properties of the Number 20551

Twenty Thousand Five Hundred Fifty-One

Basics

Value: 20550 → 20551 → 20552

Parity: odd

Prime: Yes

Previous Prime: 20549

Next Prime: 20563

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 20551

Divisors: 1, 20551

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101000001000111

Octal: 50107

Duodecimal: BA87

Hexadecimal: 5047

Square: 422343601

Square Root: 143.35619972641575

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

Primes of the form n² + (n+1)² + (n+2)² + (n+3)² + (n+4)² + (n+5)². A27867

Smallest of 3 consecutive prime numbers such that p1·p2·p3·d1·d2=average of twin prime pairs; p1,p2,p3 consecutive prime numbers; d1(δ)=p2-p1, d2(δ)=p3-p2. A153409

Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 169", based on the 5-celled von Neumann neighborhood. A279547

Prime lucky numbers k (from A031157) such that nextprime(k)=nextlucky(k). A57698

Primes in which the unit place digit is 1 and the k-th most significant digit is prime (2,3,5,7) if k is prime else is composite (4,6,8,9,0). A89704

Primes p such that p-2 and q are primes, where q is concatenation of binary representations of p and p-2: q = p·2^L + p-2, where L is the length of binary representation of p-2: L=A070939(p-2). A232237

a(1) = 2; a(n + 1) = smallest prime > a(n) such that a(n + 1) - a(n) is the product of 7 primes. A285692

a(n) = [xⁿ] (1/(1 - x/(1 - x²/(1 - x³/(1 - x⁴/(1 - x⁵/(1 - ...)))))))ⁿ, a continued fraction. A291653

Primes p such that p mod A001414(p-1) = p mod A001414(p+1). A339180

Lesser of consecutive primes whose sum is a palindromic number. A242386