31110020320 has 96 divisors (see below), whose sum is σ = 76764088800. Its totient is φ = 11902334976.

The previous prime is 31110020269. The next prime is 31110020327. The reversal of 31110020320 is 2302001113.

It is a self number, because there is not a number n which added to its sum of digits gives 31110020320.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31110020327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 304746 + ... + 393814.

It is an arithmetic number, because the mean of its divisors is an integer number (799625925).

Almost surely, 2^31110020320 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 31110020320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38382044400).

31110020320 is an abundant number, since it is smaller than the sum of its proper divisors (45654068480).

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

31110020320 is a wasteful number, since it uses less digits than its factorization.

31110020320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89180 (or 89172 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 31110020320 its reverse (2302001113), we get a palindrome (33412021433).

The spelling of 31110020320 in words is "thirty-one billion, one hundred ten million, twenty thousand, three hundred twenty".