204421845 has 16 divisors (see below), whose sum is σ = 328262400. Its totient is φ = 108629184.

The previous prime is 204421831. The next prime is 204421849. The reversal of 204421845 is 548124402.

It is not a de Polignac number, because 204421845 - 2⁴ = 204421829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204421849) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20445 + ... + 28754.

It is an arithmetic number, because the mean of its divisors is an integer number (20516400).

Almost surely, 2^204421845 is an apocalyptic number.

It is an amenable number.

204421845 is a deficient number, since it is larger than the sum of its proper divisors (123840555).

204421845 is a wasteful number, since it uses less digits than its factorization.

204421845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49484.

The product of its (nonzero) digits is 10240, while the sum is 30.

The square root of 204421845 is about 14297.6167594463. The cubic root of 204421845 is about 589.0820207023.

The spelling of 204421845 in words is "two hundred four million, four hundred twenty-one thousand, eight hundred forty-five".