20205240205 has 8 divisors (see below), whose sum is σ = 25522408800. Its totient is φ = 15313445136.

The previous prime is 20205240203. The next prime is 20205240229. The reversal of 20205240205 is 50204250202.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20205240205 - 2¹ = 20205240203 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20205240203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106343275 + ... + 106343464.

It is an arithmetic number, because the mean of its divisors is an integer number (3190301100).

Almost surely, 2^20205240205 is an apocalyptic number.

It is an amenable number.

20205240205 is a deficient number, since it is larger than the sum of its proper divisors (5317168595).

20205240205 is a wasteful number, since it uses less digits than its factorization.

20205240205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212686763.

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

Adding to 20205240205 its reverse (50204250202), we get a palindrome (70409490407).

The spelling of 20205240205 in words is "twenty billion, two hundred five million, two hundred forty thousand, two hundred five".