31002000020 has 48 divisors (see below), whose sum is σ = 69806499840. Its totient is φ = 11523592704.

The previous prime is 31002000019. The next prime is 31002000083. The reversal of 31002000020 is 2000020013.

It is a super-2 number, since 2×31002000020² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31001999971 and 31002000007.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 550244 + ... + 603963.

It is an arithmetic number, because the mean of its divisors is an integer number (1454302080).

Almost surely, 2^31002000020 is an apocalyptic number.

It is an amenable number.

31002000020 is an abundant number, since it is smaller than the sum of its proper divisors (38804499820).

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

31002000020 is a wasteful number, since it uses less digits than its factorization.

31002000020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1154312 (or 1154310 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 8.

Adding to 31002000020 its reverse (2000020013), we get a palindrome (33002020033).

The spelling of 31002000020 in words is "thirty-one billion, two million, twenty", and thus it is an aban number and an uban number.