20033431313 has 24 divisors (see below), whose sum is σ = 23469756840. Its totient is φ = 17049795840.

The previous prime is 20033431309. The next prime is 20033431403. The reversal of 20033431313 is 31313433002.

It can be written as a sum of positive squares in 4 ways, for example, as 16862840449 + 3170590864 = 129857^2 + 56308^2 .

It is not a de Polignac number, because 20033431313 - 2² = 20033431309 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20033431303) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11197223 + ... + 11199011.

It is an arithmetic number, because the mean of its divisors is an integer number (977906535).

Almost surely, 2^20033431313 is an apocalyptic number.

It is an amenable number.

20033431313 is a deficient number, since it is larger than the sum of its proper divisors (3436325527).

20033431313 is a wasteful number, since it uses less digits than its factorization.

20033431313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3297 (or 3290 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 23.

Adding to 20033431313 its reverse (31313433002), we get a palindrome (51346864315).

The spelling of 20033431313 in words is "twenty billion, thirty-three million, four hundred thirty-one thousand, three hundred thirteen".