20131323322423 has 4 divisors (see below), whose sum is σ = 20205608648608. Its totient is φ = 20057037996240.

The previous prime is 20131323322381. The next prime is 20131323322531. The reversal of 20131323322423 is 32422332313102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20131323322423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20131323326423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37142662686 + ... + 37142663227.

It is an arithmetic number, because the mean of its divisors is an integer number (5051402162152).

Almost surely, 2^{20131323322423} is an apocalyptic number.

20131323322423 is a deficient number, since it is larger than the sum of its proper divisors (74285326185).

20131323322423 is an equidigital number, since it uses as much as digits as its factorization.

20131323322423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74285326184.

The product of its (nonzero) digits is 31104, while the sum is 31.

Adding to 20131323322423 its reverse (32422332313102), we get a palindrome (52553655635525).

The spelling of 20131323322423 in words is "twenty trillion, one hundred thirty-one billion, three hundred twenty-three million, three hundred twenty-two thousand, four hundred twenty-three".