31332321020 has 96 divisors (see below), whose sum is σ = 88344055296. Its totient is φ = 9014688000.

The previous prime is 31332320993. The next prime is 31332321029. The reversal of 31332321020 is 2012323313.

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 = 31332320983 and 31332321001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31332321029) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 762506 + ... + 802545.

It is an arithmetic number, because the mean of its divisors is an integer number (920250576).

Almost surely, 2^31332321020 is an apocalyptic number.

It is an amenable number.

31332321020 is an abundant number, since it is smaller than the sum of its proper divisors (57011734276).

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

31332321020 is a wasteful number, since it uses less digits than its factorization.

31332321020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1565091 (or 1565089 counting only the distinct ones).

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

Adding to 31332321020 its reverse (2012323313), we get a palindrome (33344644333).

The spelling of 31332321020 in words is "thirty-one billion, three hundred thirty-two million, three hundred twenty-one thousand, twenty".