31311033111020 has 48 divisors (see below), whose sum is σ = 70865451088320. Its totient is φ = 11552124116736.

The previous prime is 31311033111019. The next prime is 31311033111103. The reversal of 31311033111020 is 2011133011313.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 31311033110983 and 31311033111001.

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, 45872675 + ... + 46550234.

It is an arithmetic number, because the mean of its divisors is an integer number (1476363564340).

Almost surely, 2^{31311033111020} is an apocalyptic number.

It is an amenable number.

31311033111020 is an abundant number, since it is smaller than the sum of its proper divisors (39554417977300).

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

31311033111020 is a wasteful number, since it uses less digits than its factorization.

31311033111020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92424234 (or 92424232 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 20.

Adding to 31311033111020 its reverse (2011133011313), we get a palindrome (33322166122333).

The spelling of 31311033111020 in words is "thirty-one trillion, three hundred eleven billion, thirty-three million, one hundred eleven thousand, twenty".