20542125205 has 48 divisors (see below), whose sum is σ = 29740662000. Its totient is φ = 13565131776.

The previous prime is 20542125199. The next prime is 20542125223. The reversal of 20542125205 is 50252124502.

It can be written as a sum of positive squares in 8 ways, for example, as 242144721 + 20299980484 = 15561^2 + 142478^2 .

It is not a de Polignac number, because 20542125205 - 2⁹ = 20542124693 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2902411 + ... + 2909479.

It is an arithmetic number, because the mean of its divisors is an integer number (619597125).

Almost surely, 2^20542125205 is an apocalyptic number.

It is an amenable number.

20542125205 is a deficient number, since it is larger than the sum of its proper divisors (9198536795).

20542125205 is a wasteful number, since it uses less digits than its factorization.

20542125205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7526 (or 7519 counting only the distinct ones).

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

Adding to 20542125205 its reverse (50252124502), we get a palindrome (70794249707).

The spelling of 20542125205 in words is "twenty billion, five hundred forty-two million, one hundred twenty-five thousand, two hundred five".