20542123013 has 4 divisors (see below), whose sum is σ = 21019846848. Its totient is φ = 20064399180.

The previous prime is 20542123003. The next prime is 20542123039. The reversal of 20542123013 is 31032124502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20542123013 - 2¹² = 20542118917 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 20542123013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20542123003) 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, 238861853 + ... + 238861938.

It is an arithmetic number, because the mean of its divisors is an integer number (5254961712).

Almost surely, 2^20542123013 is an apocalyptic number.

It is an amenable number.

20542123013 is a deficient number, since it is larger than the sum of its proper divisors (477723835).

20542123013 is an equidigital number, since it uses as much as digits as its factorization.

20542123013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477723834.

The product of its (nonzero) digits is 1440, while the sum is 23.

Adding to 20542123013 its reverse (31032124502), we get a palindrome (51574247515).

The spelling of 20542123013 in words is "twenty billion, five hundred forty-two million, one hundred twenty-three thousand, thirteen".