20310520423 has 4 divisors (see below), whose sum is σ = 20395501920. Its totient is φ = 20225538928.

The previous prime is 20310520409. The next prime is 20310520453. The reversal of 20310520423 is 32402501302.

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-20310520423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20310520394 and 20310520403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20310520403) 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, 42490390 + ... + 42490867.

It is an arithmetic number, because the mean of its divisors is an integer number (5098875480).

Almost surely, 2^20310520423 is an apocalyptic number.

20310520423 is a deficient number, since it is larger than the sum of its proper divisors (84981497).

20310520423 is an equidigital number, since it uses as much as digits as its factorization.

20310520423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84981496.

The product of its (nonzero) digits is 1440, while the sum is 22.

The spelling of 20310520423 in words is "twenty billion, three hundred ten million, five hundred twenty thousand, four hundred twenty-three".