31133012020 has 144 divisors (see below), whose sum is σ = 76027694400. Its totient is φ = 10671091200.

The previous prime is 31133011993. The next prime is 31133012021. The reversal of 31133012020 is 2021033113.

It is a junction number, because it is equal to n+sod(n) for n = 31133011985 and 31133012003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31133012021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9700176 + ... + 9703384.

It is an arithmetic number, because the mean of its divisors is an integer number (527970100).

Almost surely, 2^31133012020 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 31133012020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38013847200).

31133012020 is an abundant number, since it is smaller than the sum of its proper divisors (44894682380).

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

31133012020 is a wasteful number, since it uses less digits than its factorization.

31133012020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3470 (or 3457 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 31133012020 its reverse (2021033113), we get a palindrome (33154045133).

The spelling of 31133012020 in words is "thirty-one billion, one hundred thirty-three million, twelve thousand, twenty".