31003100020 has 24 divisors (see below), whose sum is σ = 65117236968. Its totient is φ = 12399196800.

The previous prime is 31003100017. The next prime is 31003100041. The reversal of 31003100020 is 2000130013.

It can be written as a sum of positive squares in 4 ways, for example, as 1740892176 + 29262207844 = 41724^2 + 171062^2 .

It is a super-2 number, since 2×31003100020² (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 congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171 + ... + 249010.

It is an arithmetic number, because the mean of its divisors is an integer number (2713218207).

Almost surely, 2^31003100020 is an apocalyptic number.

It is an amenable number.

31003100020 is an abundant number, since it is smaller than the sum of its proper divisors (34114136948).

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

31003100020 is a wasteful number, since it uses less digits than its factorization.

31003100020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255411 (or 255409 counting only the distinct ones).

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

Adding to 31003100020 its reverse (2000130013), we get a palindrome (33003230033).

The spelling of 31003100020 in words is "thirty-one billion, three million, one hundred thousand, twenty".