31102102020 has 96 divisors (see below), whose sum is σ = 95152288896. Its totient is φ = 7528038400.

The previous prime is 31102102001. The next prime is 31102102037. The reversal of 31102102020 is 2020120113.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 31102101987 and 31102102005.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 386302 + ... + 459818.

It is an arithmetic number, because the mean of its divisors is an integer number (991169676).

Almost surely, 2^31102102020 is an apocalyptic number.

31102102020 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 31102102020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47576144448).

31102102020 is an abundant number, since it is smaller than the sum of its proper divisors (64050186876).

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

31102102020 is a wasteful number, since it uses less digits than its factorization.

31102102020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74181 (or 74179 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 31102102020 its reverse (2020120113), we get a palindrome (33122222133).

The spelling of 31102102020 in words is "thirty-one billion, one hundred two million, one hundred two thousand, twenty".