204404005 has 32 divisors (see below), whose sum is σ = 282338784. Its totient is φ = 140722176.

The previous prime is 204403999. The next prime is 204404009. The reversal of 204404005 is 500404402.

It can be written as a sum of positive squares in 16 ways, for example, as 169156036 + 35247969 = 13006^2 + 5937^2 .

It is a cyclic number.

It is not a de Polignac number, because 204404005 - 2¹¹ = 204401957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204404009) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 124047 + ... + 125683.

It is an arithmetic number, because the mean of its divisors is an integer number (8823087).

Almost surely, 2^204404005 is an apocalyptic number.

It is an amenable number.

204404005 is a deficient number, since it is larger than the sum of its proper divisors (77934779).

204404005 is a wasteful number, since it uses less digits than its factorization.

204404005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1785.

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 204404005 is about 14296.9928656344. The cubic root of 204404005 is about 589.0648837063.

Adding to 204404005 its reverse (500404402), we get a palindrome (704808407).

The spelling of 204404005 in words is "two hundred four million, four hundred four thousand, five".