20205042205 has 32 divisors (see below), whose sum is σ = 25619742720. Its totient is φ = 15274436160.

The previous prime is 20205042199. The next prime is 20205042217. The reversal of 20205042205 is 50224050202.

It is a happy number.

It is not a de Polignac number, because 20205042205 - 2⁵ = 20205042173 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3399126 + ... + 3405064.

It is an arithmetic number, because the mean of its divisors is an integer number (800616960).

Almost surely, 2^20205042205 is an apocalyptic number.

It is an amenable number.

20205042205 is a deficient number, since it is larger than the sum of its proper divisors (5414700515).

20205042205 is a wasteful number, since it uses less digits than its factorization.

20205042205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6489.

The product of its (nonzero) digits is 1600, while the sum is 22.

Adding to 20205042205 its reverse (50224050202), we get a palindrome (70429092407).

The spelling of 20205042205 in words is "twenty billion, two hundred five million, forty-two thousand, two hundred five".