31664411020 has 96 divisors (see below), whose sum is σ = 74294019072. Its totient is φ = 11239200000.

The previous prime is 31664410997. The next prime is 31664411039. The reversal of 31664411020 is 2011446613.

It is a self number, because there is not a number n which added to its sum of digits gives 31664411020.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1567585 + ... + 1587655.

It is an arithmetic number, because the mean of its divisors is an integer number (773896032).

Almost surely, 2^31664411020 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31664411020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37147009536).

31664411020 is an abundant number, since it is smaller than the sum of its proper divisors (42629608052).

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

31664411020 is a wasteful number, since it uses less digits than its factorization.

31664411020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20263 (or 20261 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

Adding to 31664411020 its reverse (2011446613), we get a palindrome (33675857633).

The spelling of 31664411020 in words is "thirty-one billion, six hundred sixty-four million, four hundred eleven thousand, twenty".