20542130123 has 4 divisors (see below), whose sum is σ = 20890301880. Its totient is φ = 20193958368.

The previous prime is 20542130111. The next prime is 20542130131. The reversal of 20542130123 is 32103124502.

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 20542130123 - 2³⁴ = 3362260939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20542130173) 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, 174085790 + ... + 174085907.

It is an arithmetic number, because the mean of its divisors is an integer number (5222575470).

Almost surely, 2^20542130123 is an apocalyptic number.

20542130123 is a deficient number, since it is larger than the sum of its proper divisors (348171757).

20542130123 is an equidigital number, since it uses as much as digits as its factorization.

20542130123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348171756.

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

Adding to 20542130123 its reverse (32103124502), we get a palindrome (52645254625).

The spelling of 20542130123 in words is "twenty billion, five hundred forty-two million, one hundred thirty thousand, one hundred twenty-three".