3131311020 has 48 divisors (see below), whose sum is σ = 8933107680. Its totient is φ = 819260416.

The previous prime is 3131311019. The next prime is 3131311049. The reversal of 3131311020 is 201131313.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 489165 + ... + 495524.

It is an arithmetic number, because the mean of its divisors is an integer number (186106410).

Almost surely, 2^3131311020 is an apocalyptic number.

3131311020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3131311020 is an abundant number, since it is smaller than the sum of its proper divisors (5801796660).

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

3131311020 is a wasteful number, since it uses less digits than its factorization.

3131311020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 984754 (or 984752 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 15.

The square root of 3131311020 is about 55958.1184458520. The cubic root of 3131311020 is about 1462.9923958199.

Adding to 3131311020 its reverse (201131313), we get a palindrome (3332442333).

The spelling of 3131311020 in words is "three billion, one hundred thirty-one million, three hundred eleven thousand, twenty".