Properties of the Number 42020

Forty-Two Thousand Twenty

Basics

Value: 42019 → 42020 → 42021

Parity: even

Prime: No

Previous Prime: 42019

Next Prime: 42023

Digit Sum: 8

Digital Root: 8

Palindrome: No

Factorization: 2 ² × 5 × 11 × 191

Divisors: 1, 2, 4, 5, 10, 11, 20, 22, 44, 55

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 1010010000100100

Octal: 122044

Duodecimal: 20398

Hexadecimal: a424

Square: 1765680400

Square Root: 204.98780451529305

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 σ(k) = ψ(k) + τ(k)³. A390297

Start with 0. Successive digits in the sequence must differ by 2. Adjoin the smallest number not yet in the sequence. A228327

Numbers n such that n and n+1 both have 24 divisors. A274362

a(n) = 25·n² - 5. A158446

Number of (w,x,y,z) with all terms in {0,...,n} and |w-x|<|x-y|<|y-z|. A212902

n written in fractional base 6/4. A24637

Number of proper factorizations of p1ⁿ*p2³, where p1 and p2 are distinct primes. A31126

A Catalan transform of [xⁿ](1/(1-2x-2x²)) (A002605). A155084

Even numbers such that the sum of the even divisors and the sum of the odd divisors are a square or a cube. A263695

Numbers k such that k and k+1 both have the prime signature (2,1,1,1) (A189982). A336658