31102000020 has 288 divisors, whose sum is σ = 116334097152. Its totient is φ = 6549755904.

The previous prime is 31102000019. The next prime is 31102000051. The reversal of 31102000020 is 2000020113.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 31101999966 and 31102000011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 10530864 + ... + 10533816.

Almost surely, 2^31102000020 is an apocalyptic number.

31102000020 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 31102000020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58167048576).

31102000020 is an abundant number, since it is smaller than the sum of its proper divisors (85232097132).

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

31102000020 is a wasteful number, since it uses less digits than its factorization.

31102000020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3631 (or 3626 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

Adding to 31102000020 its reverse (2000020113), we get a palindrome (33102020133).

The spelling of 31102000020 in words is "thirty-one billion, one hundred two million, twenty", and thus it is an aban number.