231220120 has 64 divisors (see below), whose sum is σ = 549964800. Its totient is φ = 87246720.

The previous prime is 231220097. The next prime is 231220153. The reversal of 231220120 is 21022132.

It is a self number, because there is not a number n which added to its sum of digits gives 231220120.

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, 232825 + ... + 233815.

It is an arithmetic number, because the mean of its divisors is an integer number (8593200).

Almost surely, 2^231220120 is an apocalyptic number.

231220120 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 231220120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (274982400).

231220120 is an abundant number, since it is smaller than the sum of its proper divisors (318744680).

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

231220120 is a wasteful number, since it uses less digits than its factorization.

231220120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1328 (or 1324 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 231220120 is about 15205.9238456596. The cubic root of 231220120 is about 613.7740754034.

Adding to 231220120 its reverse (21022132), we get a palindrome (252242252).

The spelling of 231220120 in words is "two hundred thirty-one million, two hundred twenty thousand, one hundred twenty".