31113111020 has 12 divisors (see below), whose sum is σ = 65337533184. Its totient is φ = 12445244400.

The previous prime is 31113110993. The next prime is 31113111053. The reversal of 31113111020 is 2011131113.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 31113110986 and 31113111004.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 777827756 + ... + 777827795.

It is an arithmetic number, because the mean of its divisors is an integer number (5444794432).

Almost surely, 2^31113111020 is an apocalyptic number.

It is an amenable number.

31113111020 is an abundant number, since it is smaller than the sum of its proper divisors (34224422164).

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

31113111020 is a wasteful number, since it uses less digits than its factorization.

31113111020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1555655560 (or 1555655558 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 14.

Adding to 31113111020 its reverse (2011131113), we get a palindrome (33124242133).

The spelling of 31113111020 in words is "thirty-one billion, one hundred thirteen million, one hundred eleven thousand, twenty".