20131320203313 has 32 divisors (see below), whose sum is σ = 29572754631552. Its totient is φ = 12079626624000.

The previous prime is 20131320203299. The next prime is 20131320203321. The reversal of 20131320203313 is 31330202313102.

It is not a de Polignac number, because 20131320203313 - 2²⁸ = 20131051767857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20131320203353) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 138636895 + ... + 138782027.

It is an arithmetic number, because the mean of its divisors is an integer number (924148582236).

Almost surely, 2^{20131320203313} is an apocalyptic number.

It is an amenable number.

20131320203313 is a deficient number, since it is larger than the sum of its proper divisors (9441434428239).

20131320203313 is a wasteful number, since it uses less digits than its factorization.

20131320203313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186865.

The product of its (nonzero) digits is 1944, while the sum is 24.

Adding to 20131320203313 its reverse (31330202313102), we get a palindrome (51461522516415).

The spelling of 20131320203313 in words is "twenty trillion, one hundred thirty-one billion, three hundred twenty million, two hundred three thousand, three hundred thirteen".