31331100020 has 96 divisors (see below), whose sum is σ = 74985523200. Its totient is φ = 10884959360.

The previous prime is 31331100013. The next prime is 31331100041. The reversal of 31331100020 is 2000113313.

It is a junction number, because it is equal to n+sod(n) for n = 31331099968 and 31331100004.

It is a congruent number.

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, 4970831 + ... + 4977129.

It is an arithmetic number, because the mean of its divisors is an integer number (781099200).

Almost surely, 2^31331100020 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 31331100020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37492761600).

31331100020 is an abundant number, since it is smaller than the sum of its proper divisors (43654423180).

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

31331100020 is a wasteful number, since it uses less digits than its factorization.

31331100020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7325 (or 7323 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 14.

Adding to 31331100020 its reverse (2000113313), we get a palindrome (33331213333).

The spelling of 31331100020 in words is "thirty-one billion, three hundred thirty-one million, one hundred thousand, twenty".