31203131020 has 24 divisors (see below), whose sum is σ = 65533071744. Its totient is φ = 12480014976.

The previous prime is 31203130997. The next prime is 31203131053. The reversal of 31203131020 is 2013130213.

It is a junction number, because it is equal to n+sod(n) for n = 31203130985 and 31203131003.

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, 145024 + ... + 288856.

It is an arithmetic number, because the mean of its divisors is an integer number (2730544656).

Almost surely, 2^31203131020 is an apocalyptic number.

It is an amenable number.

31203131020 is an abundant number, since it is smaller than the sum of its proper divisors (34329940724).

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

31203131020 is a wasteful number, since it uses less digits than its factorization.

31203131020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154689 (or 154687 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 31203131020 its reverse (2013130213), we get a palindrome (33216261233).

The spelling of 31203131020 in words is "thirty-one billion, two hundred three million, one hundred thirty-one thousand, twenty".