204201805 has 16 divisors (see below), whose sum is σ = 256425984. Its totient is φ = 155917440.

The previous prime is 204201757. The next prime is 204201817. The reversal of 204201805 is 508102402.

It is not a de Polignac number, because 204201805 - 2⁷ = 204201677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2292 + ... + 20338.

It is an arithmetic number, because the mean of its divisors is an integer number (16026624).

Almost surely, 2^204201805 is an apocalyptic number.

It is an amenable number.

204201805 is a deficient number, since it is larger than the sum of its proper divisors (52224179).

204201805 is a wasteful number, since it uses less digits than its factorization.

204201805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18156.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 204201805 is about 14289.9196988647. The cubic root of 204201805 is about 588.8705818775.

The spelling of 204201805 in words is "two hundred four million, two hundred one thousand, eight hundred five".