231335320 has 64 divisors (see below), whose sum is σ = 570175200. Its totient is φ = 84080640.

The previous prime is 231335309. The next prime is 231335339. The reversal of 231335320 is 23533132.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 231335291 and 231335300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13855 + ... + 25585.

Almost surely, 2^231335320 is an apocalyptic number.

231335320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231335320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (285087600).

231335320 is an abundant number, since it is smaller than the sum of its proper divisors (338839880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231335320 is a wasteful number, since it uses less digits than its factorization.

231335320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11788 (or 11784 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 22.

The square root of 231335320 is about 15209.7113713574. The cubic root of 231335320 is about 613.8759913238.

Adding to 231335320 its reverse (23533132), we get a palindrome (254868452).

The spelling of 231335320 in words is "two hundred thirty-one million, three hundred thirty-five thousand, three hundred twenty".