20726315123 has 4 divisors (see below), whose sum is σ = 21286485840. Its totient is φ = 20166144408.

The previous prime is 20726315111. The next prime is 20726315173. The reversal of 20726315123 is 32151362702.

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 20726315123 - 2⁸ = 20726314867 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 20726315123.

It is not an unprimeable number, because it can be changed into a prime (20726315173) 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, 280085303 + ... + 280085376.

It is an arithmetic number, because the mean of its divisors is an integer number (5321621460).

Almost surely, 2^20726315123 is an apocalyptic number.

20726315123 is a deficient number, since it is larger than the sum of its proper divisors (560170717).

20726315123 is an equidigital number, since it uses as much as digits as its factorization.

20726315123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560170716.

The product of its (nonzero) digits is 15120, while the sum is 32.

Adding to 20726315123 its reverse (32151362702), we get a palindrome (52877677825).

The spelling of 20726315123 in words is "twenty billion, seven hundred twenty-six million, three hundred fifteen thousand, one hundred twenty-three".