31113001020 has 48 divisors (see below), whose sum is σ = 87802380288. Its totient is φ = 8231469120.

The previous prime is 31113001001. The next prime is 31113001021. The reversal of 31113001020 is 2010031113.

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 = 31113000987 and 31113001005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31113001021) 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, 2033916 + ... + 2049155.

It is an arithmetic number, because the mean of its divisors is an integer number (1829216256).

Almost surely, 2^31113001020 is an apocalyptic number.

31113001020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31113001020 is an abundant number, since it is smaller than the sum of its proper divisors (56689379268).

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

31113001020 is a wasteful number, since it uses less digits than its factorization.

31113001020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4083210 (or 4083208 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 12.

Adding to 31113001020 its reverse (2010031113), we get a palindrome (33123032133).

The spelling of 31113001020 in words is "thirty-one billion, one hundred thirteen million, one thousand, twenty".