20013133711523 has 4 divisors (see below), whose sum is σ = 20016561210720. Its totient is φ = 20009706212328.

The previous prime is 20013133711489. The next prime is 20013133711531. The reversal of 20013133711523 is 32511733131002.

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

It is a cyclic number.

It is not a de Polignac number, because 20013133711523 - 2²⁰ = 20013132662947 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 20013133711523.

It is not an unprimeable number, because it can be changed into a prime (20013133711573) 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 3 ways as a sum of consecutive naturals, for example, 1713740840 + ... + 1713752517.

It is an arithmetic number, because the mean of its divisors is an integer number (5004140302680).

Almost surely, 2^{20013133711523} is an apocalyptic number.

20013133711523 is a deficient number, since it is larger than the sum of its proper divisors (3427499197).

20013133711523 is an equidigital number, since it uses as much as digits as its factorization.

20013133711523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3427499196.

The product of its (nonzero) digits is 11340, while the sum is 32.

Adding to 20013133711523 its reverse (32511733131002), we get a palindrome (52524866842525).

The spelling of 20013133711523 in words is "twenty trillion, thirteen billion, one hundred thirty-three million, seven hundred eleven thousand, five hundred twenty-three".