31102303020 has 96 divisors (see below), whose sum is σ = 88960972800. Its totient is φ = 8116796160.

The previous prime is 31102302991. The next prime is 31102303027. The reversal of 31102303020 is 2030320113.

It is a super-2 number, since 2×31102303020² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (31102303027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 706989 + ... + 749691.

It is an arithmetic number, because the mean of its divisors is an integer number (926676800).

Almost surely, 2^31102303020 is an apocalyptic number.

31102303020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31102303020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44480486400).

31102303020 is an abundant number, since it is smaller than the sum of its proper divisors (57858669780).

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

31102303020 is a wasteful number, since it uses less digits than its factorization.

31102303020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42975 (or 42973 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 15.

Adding to 31102303020 its reverse (2030320113), we get a palindrome (33132623133).

The spelling of 31102303020 in words is "thirty-one billion, one hundred two million, three hundred three thousand, twenty".