231132220 has 48 divisors (see below), whose sum is σ = 532290528. Its totient is φ = 83605760.

The previous prime is 231132217. The next prime is 231132257. The reversal of 231132220 is 22231132.

It is a junction number, because it is equal to n+sod(n) for n = 231132194 and 231132203.

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, 40674 + ... + 46006.

It is an arithmetic number, because the mean of its divisors is an integer number (11089386).

Almost surely, 2^231132220 is an apocalyptic number.

231132220 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 231132220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (266145264).

231132220 is an abundant number, since it is smaller than the sum of its proper divisors (301158308).

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

231132220 is a wasteful number, since it uses less digits than its factorization.

231132220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5550 (or 5548 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 231132220 is about 15203.0332499801. The cubic root of 231132220 is about 613.6962886617.

Adding to 231132220 its reverse (22231132), we get a palindrome (253363352).

The spelling of 231132220 in words is "two hundred thirty-one million, one hundred thirty-two thousand, two hundred twenty".