31011111100020 has 48 divisors (see below), whose sum is σ = 87285724259328. Its totient is φ = 8226333133440.

The previous prime is 31011111100007. The next prime is 31011111100027. The reversal of 31011111100020 is 2000111111013.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 31011111099969 and 31011111100005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31011111100027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1353003859 + ... + 1353026778.

It is an arithmetic number, because the mean of its divisors is an integer number (1818452588736).

Almost surely, 2^{31011111100020} is an apocalyptic number.

31011111100020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31011111100020 is an abundant number, since it is smaller than the sum of its proper divisors (56274613159308).

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

31011111100020 is a wasteful number, since it uses less digits than its factorization.

31011111100020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2706030840 (or 2706030838 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 12.

Adding to 31011111100020 its reverse (2000111111013), we get a palindrome (33011222211033).

The spelling of 31011111100020 in words is "thirty-one trillion, eleven billion, one hundred eleven million, one hundred thousand, twenty".