Properties of the Number 20420

Twenty Thousand Four Hundred Twenty

Basics

Value: 20419 → 20420 → 20421

Parity: even

Prime: No

Previous Prime: 20411

Next Prime: 20431

Digit Sum: 8

Digital Root: 8

Palindrome: No

Factorization: 2 ² × 5 × 1021

Divisors: 1, 2, 4, 5, 10, 20, 1021, 2042, 4084, 5105

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

4823 Try Today's Challenge

Representations

Binary: 100111111000100

Octal: 47704

Duodecimal: B998

Hexadecimal: 4fc4

Square: 416976400

Square Root: 142.89856542317

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

Triangle of 3-Eulerian numbers. A144697

Number of formula representations of n using addition, exponentiation and the constant 1. A214843

G.f. A(x) satisfies: A(x) = 1 + x + x³ * A(x/(1 - x)) / (1 - x). A346052

Numbers k such that 58/111*(10^3·k-1)-1 is prime. A178321

a(n) = ∑_{k=0..floor(n/2)} binomial(k+3,3) * binomial(k,n-2·k)². A377149

Partial sums of the tricapped prism numbers A005920. A187673

Numbers k such that the continued fraction for sqrt(k) has period 81. A20420