204644005 has 16 divisors (see below), whose sum is σ = 249634944. Its totient is φ = 161029440.

The previous prime is 204643993. The next prime is 204644021. The reversal of 204644005 is 500446402.

204644005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 204644005 - 2¹³ = 204635813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79590 + ... + 82120.

It is an arithmetic number, because the mean of its divisors is an integer number (15602184).

Almost surely, 2^204644005 is an apocalyptic number.

It is an amenable number.

204644005 is a deficient number, since it is larger than the sum of its proper divisors (44990939).

204644005 is a wasteful number, since it uses less digits than its factorization.

204644005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2796.

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 204644005 is about 14305.3837767464. The cubic root of 204644005 is about 589.2953427855.

It can be divided in two parts, 20 and 4644005, that added together give a square (4644025 = 2155²).

The spelling of 204644005 in words is "two hundred four million, six hundred forty-four thousand, five".