31020220232 has 16 divisors (see below), whose sum is σ = 58177191600. Its totient is φ = 15506302480.

The previous prime is 31020220207. The next prime is 31020220237. The reversal of 31020220232 is 23202202013.

It is a self number, because there is not a number n which added to its sum of digits gives 31020220232.

It is not an unprimeable number, because it can be changed into a prime (31020220237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 441182 + ... + 506637.

It is an arithmetic number, because the mean of its divisors is an integer number (3636074475).

Almost surely, 2^31020220232 is an apocalyptic number.

It is an amenable number.

31020220232 is a deficient number, since it is larger than the sum of its proper divisors (27156971368).

31020220232 is a wasteful number, since it uses less digits than its factorization.

31020220232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 951916 (or 951912 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

Adding to 31020220232 its reverse (23202202013), we get a palindrome (54222422245).

The spelling of 31020220232 in words is "thirty-one billion, twenty million, two hundred twenty thousand, two hundred thirty-two".