31103000020 has 48 divisors (see below), whose sum is σ = 66191489280. Its totient is φ = 12274898816.

The previous prime is 31103000009. The next prime is 31103000023. The reversal of 31103000020 is 2000030113.

It is a super-2 number, since 2×31103000020² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 31102999970 and 31103000006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31103000023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1271061 + ... + 1295299.

It is an arithmetic number, because the mean of its divisors is an integer number (1378989360).

Almost surely, 2^31103000020 is an apocalyptic number.

It is an amenable number.

31103000020 is an abundant number, since it is smaller than the sum of its proper divisors (35088489260).

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

31103000020 is a wasteful number, since it uses less digits than its factorization.

31103000020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25104 (or 25102 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 10.

Adding to 31103000020 its reverse (2000030113), we get a palindrome (33103030133).

The spelling of 31103000020 in words is "thirty-one billion, one hundred three million, twenty", and thus it is an aban number.