231342220 has 12 divisors (see below), whose sum is σ = 485818704. Its totient is φ = 92536880.

The previous prime is 231342161. The next prime is 231342227. The reversal of 231342220 is 22243132.

It is not an unprimeable number, because it can be changed into a prime (231342227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5783536 + ... + 5783575.

It is an arithmetic number, because the mean of its divisors is an integer number (40484892).

Almost surely, 2^231342220 is an apocalyptic number.

231342220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231342220 is an abundant number, since it is smaller than the sum of its proper divisors (254476484).

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

231342220 is a wasteful number, since it uses less digits than its factorization.

231342220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11567120 (or 11567118 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 231342220 is about 15209.9381984280. The cubic root of 231342220 is about 613.8820945887.

Adding to 231342220 its reverse (22243132), we get a palindrome (253585352).

The spelling of 231342220 in words is "two hundred thirty-one million, three hundred forty-two thousand, two hundred twenty".