231146220 has 48 divisors (see below), whose sum is σ = 647877888. Its totient is φ = 61575360.

The previous prime is 231146219. The next prime is 231146239. The reversal of 231146220 is 22641132.

231146220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 98865 + ... + 101175.

It is an arithmetic number, because the mean of its divisors is an integer number (13497456).

Almost surely, 2^231146220 is an apocalyptic number.

231146220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231146220 is an abundant number, since it is smaller than the sum of its proper divisors (416731668).

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

231146220 is a wasteful number, since it uses less digits than its factorization.

231146220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3990 (or 3988 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 231146220 is about 15203.4936774414. The cubic root of 231146220 is about 613.7086792240.

Adding to 231146220 its reverse (22641132), we get a palindrome (253787352).

The spelling of 231146220 in words is "two hundred thirty-one million, one hundred forty-six thousand, two hundred twenty".