20131331313 has 8 divisors (see below), whose sum is σ = 26872881408. Its totient is φ = 13405334384.

The previous prime is 20131331291. The next prime is 20131331327. The reversal of 20131331313 is 31313313102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20131331313 - 2⁶ = 20131331249 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20131331313.

It is not an unprimeable number, because it can be changed into a prime (20131331393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3885270 + ... + 3890447.

It is an arithmetic number, because the mean of its divisors is an integer number (3359110176).

Almost surely, 2^20131331313 is an apocalyptic number.

It is an amenable number.

20131331313 is a deficient number, since it is larger than the sum of its proper divisors (6741550095).

20131331313 is an equidigital number, since it uses as much as digits as its factorization.

20131331313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7776583.

The product of its (nonzero) digits is 486, while the sum is 21.

Adding to 20131331313 its reverse (31313313102), we get a palindrome (51444644415).

The spelling of 20131331313 in words is "twenty billion, one hundred thirty-one million, three hundred thirty-one thousand, three hundred thirteen".