231542320 has 20 divisors (see below), whose sum is σ = 538336080. Its totient is φ = 92616896.

The previous prime is 231542309. The next prime is 231542323. The reversal of 231542320 is 23245132.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×231542320² = 107223691901964800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 231542291 and 231542300.

It is not an unprimeable number, because it can be changed into a prime (231542323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1447060 + ... + 1447219.

It is an arithmetic number, because the mean of its divisors is an integer number (26916804).

Almost surely, 2^231542320 is an apocalyptic number.

231542320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231542320 is an abundant number, since it is smaller than the sum of its proper divisors (306793760).

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

231542320 is a wasteful number, since it uses less digits than its factorization.

231542320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2894292 (or 2894286 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 231542320 is about 15216.5147126403. The cubic root of 231542320 is about 614.0590365060.

Adding to 231542320 its reverse (23245132), we get a palindrome (254787452).

The spelling of 231542320 in words is "two hundred thirty-one million, five hundred forty-two thousand, three hundred twenty".