31102020320 has 96 divisors (see below), whose sum is σ = 84262949568. Its totient is φ = 10627043328.

The previous prime is 31102020307. The next prime is 31102020331. The reversal of 31102020320 is 2302020113.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 31102020295 and 31102020304.

It is a congruent number.

It is an unprimeable number.

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, 280772 + ... + 375548.

It is an arithmetic number, because the mean of its divisors is an integer number (877739058).

Almost surely, 2^31102020320 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 31102020320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42131474784).

31102020320 is an abundant number, since it is smaller than the sum of its proper divisors (53160929248).

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

31102020320 is a wasteful number, since it uses less digits than its factorization.

31102020320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95092 (or 95084 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 31102020320 its reverse (2302020113), we get a palindrome (33404040433).

The spelling of 31102020320 in words is "thirty-one billion, one hundred two million, twenty thousand, three hundred twenty".