20542140055 has 4 divisors (see below), whose sum is σ = 24650568072. Its totient is φ = 16433712040.

The previous prime is 20542140013. The next prime is 20542140133. The reversal of 20542140055 is 55004124502.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20542140055 - 2¹¹ = 20542138007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2054214001 + ... + 2054214010.

It is an arithmetic number, because the mean of its divisors is an integer number (6162642018).

Almost surely, 2^20542140055 is an apocalyptic number.

20542140055 is a deficient number, since it is larger than the sum of its proper divisors (4108428017).

20542140055 is an equidigital number, since it uses as much as digits as its factorization.

20542140055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4108428016.

The product of its (nonzero) digits is 8000, while the sum is 28.

Adding to 20542140055 its reverse (55004124502), we get a palindrome (75546264557).

The spelling of 20542140055 in words is "twenty billion, five hundred forty-two million, one hundred forty thousand, fifty-five".