Properties of the Number 20647

Twenty Thousand Six Hundred Forty-Seven

Basics

Value: 20646 → 20647 → 20648

Parity: odd

Prime: No

Previous Prime: 20641

Next Prime: 20663

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 11 × 1877

Divisors: 1, 11, 1877, 20647

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101000010100111

Octal: 50247

Duodecimal: BB47

Hexadecimal: 50a7

Square: 426298609

Square Root: 143.69063991784571

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

Numbers k such that 2^k - 19 is prime. A96819

a(n) = 15n² + 3n + 1. A165806

Number of primitive (aperiodic) palindromic structures using a maximum of six different symbols. A56480

Numerator of the barycenter of first n primes defined as a(n) = numerator(∑_i=1..n (i·prime(i)) / ∑_i=1..n prime(i)). A306834

Number of primitive (period n) periodic palindromic structures using a maximum of six different symbols. A56517

Denominators of the convergents to sqrt(14)/2 = A294969. A295337

Number of n X 2 0..2 arrays with rows and columns in nondecreasing order. A184130

a(n) = a(n-1) + 4·a(n-3) + 2·a(n-4) + 2·a(n-5); a(0) = a(1) = a(2) = 1, a(3) = 5, a(4) = 11. A337492

T(n,k)=Number of nXk 0..2 arrays with rows and columns in nondecreasing order. A184137

Numerators of the convergents to sqrt(14)/2 = A294969. A295336