Properties of the Number 20671

Twenty Thousand Six Hundred Seventy-One

Basics

Value: 20670 → 20671 → 20672

Parity: odd

Prime: No

Previous Prime: 20663

Next Prime: 20681

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 7 × 2953

Divisors: 1, 7, 2953, 20671

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101000010111111

Octal: 50277

Duodecimal: BB67

Hexadecimal: 50bf

Square: 427290241

Square Root: 143.77412840980813

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 n such that n!8-2 is prime. A204664

a(0) = 2, thereafter a(n+1) is the nearest integer to 4·a(n)/3. A390254

Number of scalene triangles, distinct up to congruence, on an n X n grid (or geoboard). A190313

Numerators of continued fraction convergents to sqrt(277). A41520

a(n) = ∑_k=1..n σ(n·k). A372710

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 459", based on the 5-celled von Neumann neighborhood. A272289

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 603", based on the 5-celled von Neumann neighborhood. A273173

Numbers of ways in which a unit disc can be dissected into 6n curvilinear triangles, at least one of which does not contain the center. A193362

Numbers of form x² + 8 y². A20671

Number of (n+2)X(5+2) 0..3 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 3 4 6 or 7. A252136