231310220 has 48 divisors (see below), whose sum is σ = 503328000. Its totient is φ = 89199360.

The previous prime is 231310213. The next prime is 231310229. The reversal of 231310220 is 22013132.

It is a happy number.

It is a super-4 number, since 4×231310220⁴ (a number of 35 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 231310195 and 231310204.

It is not an unprimeable number, because it can be changed into a prime (231310229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 215846 + ... + 216914.

It is an arithmetic number, because the mean of its divisors is an integer number (10486000).

Almost surely, 2^231310220 is an apocalyptic number.

231310220 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 231310220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (251664000).

231310220 is an abundant number, since it is smaller than the sum of its proper divisors (272017780).

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

231310220 is a wasteful number, since it uses less digits than its factorization.

231310220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1458 (or 1456 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 231310220 is about 15208.8862182607. The cubic root of 231310220 is about 613.8537885683.

Adding to 231310220 its reverse (22013132), we get a palindrome (253323352).

The spelling of 231310220 in words is "two hundred thirty-one million, three hundred ten thousand, two hundred twenty".