31000311020 has 96 divisors (see below), whose sum is σ = 75724486656. Its totient is φ = 10440057600.

The previous prime is 31000310993. The next prime is 31000311077. The reversal of 31000311020 is 2011300013.

It is a super-2 number, since 2×31000311020² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31000310992 and 31000311010.

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, 7538765 + ... + 7542875.

It is an arithmetic number, because the mean of its divisors is an integer number (788796736).

Almost surely, 2^31000311020 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 31000311020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37862243328).

31000311020 is an abundant number, since it is smaller than the sum of its proper divisors (44724175636).

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

31000311020 is a wasteful number, since it uses less digits than its factorization.

31000311020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5071 (or 5069 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 11.

Adding to 31000311020 its reverse (2011300013), we get a palindrome (33011611033).

The spelling of 31000311020 in words is "thirty-one billion, three hundred eleven thousand, twenty".