3231331220 has 24 divisors (see below), whose sum is σ = 7307780424. Its totient is φ = 1193106816.

The previous prime is 3231331127. The next prime is 3231331241. The reversal of 3231331220 is 221331323.

It can be written as a sum of positive squares in 4 ways, for example, as 523585924 + 2707745296 = 22882^2 + 52036^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 3231331192 and 3231331201.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 6213839 + ... + 6214358.

It is an arithmetic number, because the mean of its divisors is an integer number (304490851).

Almost surely, 2^3231331220 is an apocalyptic number.

It is an amenable number.

3231331220 is an abundant number, since it is smaller than the sum of its proper divisors (4076449204).

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

3231331220 is a wasteful number, since it uses less digits than its factorization.

3231331220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12428219 (or 12428217 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 20.

The square root of 3231331220 is about 56844.7994103242. The cubic root of 3231331220 is about 1478.4063714379.

Adding to 3231331220 its reverse (221331323), we get a palindrome (3452662543).

The spelling of 3231331220 in words is "three billion, two hundred thirty-one million, three hundred thirty-one thousand, two hundred twenty".