231243320 has 64 divisors (see below), whose sum is σ = 648691200. Its totient is φ = 72074880.

The previous prime is 231243317. The next prime is 231243323. The reversal of 231243320 is 23342132.

It is an interprime number because it is at equal distance from previous prime (231243317) and next prime (231243323).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 231243292 and 231243301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231243323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34460 + ... + 40619.

It is an arithmetic number, because the mean of its divisors is an integer number (10135800).

Almost surely, 2^231243320 is an apocalyptic number.

231243320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231243320 is an abundant number, since it is smaller than the sum of its proper divisors (417447880).

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

231243320 is a wasteful number, since it uses less digits than its factorization.

231243320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75108 (or 75104 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 231243320 is about 15206.6866871124. The cubic root of 231243320 is about 613.7946028591.

Adding to 231243320 its reverse (23342132), we get a palindrome (254585452).

The spelling of 231243320 in words is "two hundred thirty-one million, two hundred forty-three thousand, three hundred twenty".