Properties of the Number 1720

One Thousand Seven Hundred Twenty

Basics

Value: 1719 → 1720 → 1721

Parity: even

Prime: No

Previous Prime: 1709

Next Prime: 1721

Digit Sum: 10

Digital Root: 1

Palindrome: No

Factorization: 2 ³ × 5 × 43

Divisors: 1, 2, 4, 5, 8, 10, 20, 40, 43, 86

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 11010111000

Octal: 3270

Duodecimal: BB4

Hexadecimal: 6b8

Square: 2958400

Square Root: 41.47288270665544

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

Sum of the first n primes. A7504

a(n) = n*(n+3). A28552

Numbers that are the sum of 12 positive 6th powers. A3368

Multiples of 20 containing a 20 in their decimal representation. A121040

Triangular array: the fission of the polynomial sequence ((x+1)ⁿ: n >= 0) by the polynomial sequence ((x+2)ⁿ: n >= 0). (Fission is defined at Comments.) A193842

Iterate the map in A006369 starting at 144. A185589

Triangle read by rows: T(n,f) is the number of rooted maps with n edges and f faces on an orientable surface of genus 1. A269921

Number of integer partitions of n whose parts all divide n and whose length also divides n. A326842

Index of 10ⁿ in A302656, or -1 if 10ⁿ does not appear in A302656. A377906

a(n) = n XOR n². A169810