20131031233013 has 4 divisors (see below), whose sum is σ = 20185884179520. Its totient is φ = 20076178286508.

The previous prime is 20131031232971. The next prime is 20131031233057. The reversal of 20131031233013 is 31033213013102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20131031233013 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20131031233013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20131031233063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27426472703 + ... + 27426473436.

It is an arithmetic number, because the mean of its divisors is an integer number (5046471044880).

Almost surely, 2^{20131031233013} is an apocalyptic number.

It is an amenable number.

20131031233013 is a deficient number, since it is larger than the sum of its proper divisors (54852946507).

20131031233013 is an equidigital number, since it uses as much as digits as its factorization.

20131031233013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54852946506.

The product of its (nonzero) digits is 972, while the sum is 23.

Adding to 20131031233013 its reverse (31033213013102), we get a palindrome (51164244246115).

The spelling of 20131031233013 in words is "twenty trillion, one hundred thirty-one billion, thirty-one million, two hundred thirty-three thousand, thirteen".