20013777123523 has 4 divisors (see below), whose sum is σ = 20341871830528. Its totient is φ = 19685682416520.

The previous prime is 20013777123499. The next prime is 20013777123541. The reversal of 20013777123523 is 32532177731002.

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-20013777123523 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 20013777123523.

It is not an unprimeable number, because it can be changed into a prime (20013777123583) 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, 164047353411 + ... + 164047353532.

It is an arithmetic number, because the mean of its divisors is an integer number (5085467957632).

Almost surely, 2^{20013777123523} is an apocalyptic number.

20013777123523 is a deficient number, since it is larger than the sum of its proper divisors (328094707005).

20013777123523 is an equidigital number, since it uses as much as digits as its factorization.

20013777123523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328094707004.

The product of its (nonzero) digits is 370440, while the sum is 43.

The spelling of 20013777123523 in words is "twenty trillion, thirteen billion, seven hundred seventy-seven million, one hundred twenty-three thousand, five hundred twenty-three".