231330220 has 72 divisors (see below), whose sum is σ = 565481952. Its totient is φ = 79157760.

The previous prime is 231330217. The next prime is 231330227. The reversal of 231330220 is 22033132.

It is a junction number, because it is equal to n+sod(n) for n = 231330194 and 231330203.

It is not an unprimeable number, because it can be changed into a prime (231330227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38329 + ... + 43951.

It is an arithmetic number, because the mean of its divisors is an integer number (7853916).

Almost surely, 2^231330220 is an apocalyptic number.

231330220 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 231330220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (282740976).

231330220 is an abundant number, since it is smaller than the sum of its proper divisors (334151732).

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

231330220 is a wasteful number, since it uses less digits than its factorization.

231330220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5671 (or 5658 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 16.

The square root of 231330220 is about 15209.5437143920. The cubic root of 231330220 is about 613.8714801370.

Adding to 231330220 its reverse (22033132), we get a palindrome (253363352).

The spelling of 231330220 in words is "two hundred thirty-one million, three hundred thirty thousand, two hundred twenty".