Properties of the Number 20885

Twenty Thousand Eight Hundred Eighty-Five

Basics

Value: 20884 → 20885 → 20886

Parity: odd

Prime: No

Previous Prime: 20879

Next Prime: 20887

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 5 × 4177

Divisors: 1, 5, 4177, 20885

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101000110010101

Octal: 50625

Duodecimal: 10105

Hexadecimal: 5195

Square: 436183225

Square Root: 144.51643505151932

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

List of different composites in Pascal-like triangles with index of asymmetry y = 2 and index of obliquity z = 0 or z = 1. A141066

a(n)*a(n-7) = a(n-1)a(n-6)+a(n-3)+a(n-4) with initial terms a(1)=...=a(7)=1. A133846

This is to A139025 as A139025 to A014688, see A139025 for details. A139026

a(n) is the largest number in the n-th row of triangle A140997. A141018

Bases b for which there exists an integer y such that y³ in base b looks like [c,d,e,c,d,e] for base-b digits c,d,e. A290185

G.f. y(x) is solution of·y³ - (1 + x²) y + 1 = 0 with y(0) = 1. A137265

Numbers k such that the continued fraction for sqrt(k) has period 55. A20394

Numbers whose base-12 representation has exactly 5 runs. A43654

Discriminants of real quadratic fields with class number 2 and related continued fraction period length of 15. A51980

Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 5-point zee 1,1 2,1 2,2 2,3 3,3 in any orientation. A146067