Properties of the Number 80020

Eighty Thousand Twenty

Basics

Value: 80019 → 80020 → 80021

Parity: even

Prime: No

Previous Prime: 79999

Next Prime: 80021

Digit Sum: 10

Digital Root: 1

Palindrome: No

Factorization: 2 ² × 5 × 4001

Divisors: 1, 2, 4, 5, 10, 20, 4001, 8002, 16004, 20005

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 10011100010010100

Octal: 234224

Duodecimal: 3A384

Hexadecimal: 13894

Square: 6403200400

Square Root: 282.8780656042458

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

Number of primes less than 10ⁿ with initial digit 1. A73517

Consider the Diophantine equation x³ + y³ = z³ + 1 (1<x<y<z) or 'Fermat near misses'. Arrange solutions by increasing values of z (see A050791), and increasing values of y in case of ties. Sequence gives values of y. A50793

Times on a 12-hour digital clock with 6 digits at which the three continuously moving hands of an analog clock, in the best approximation, enclose the same angles with one another, i.e., have the smallest sum of squares of the deviations from 120 degrees. When interpreting the terms as times of the day in the form hh:mm:ss, padding to the left with zeros is assumed. A347040

Number of halving steps to reach 1 in '3x+1' problem, or -1 if this never happens. A6666

a(n) = 4ⁿ*(3·n)!/((n+1)!*(2·n+1)!). A6335

Expansion of g.f. x*(1 + x)*(1 + 6·x + x²)/(1 - x)⁷. A6858

Number of 1-factorizations of complete graph K_2n. A438

Number of primes <= prime(n) which begin with a 1. A65680

From enumerating paths in the plane. A91962

Square array read by antidiagonals: S(p,q) = (p+q+1)!(2p+2q+1)!/((p+1)!(2p+1)!(q+1)!(2q+1)!) (p,q>=0). A111910