204388805 has 4 divisors (see below), whose sum is σ = 245266572. Its totient is φ = 163511040.

The previous prime is 204388801. The next prime is 204388819. The reversal of 204388805 is 508883402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 148303684 + 56085121 = 12178^2 + 7489^2 .

It is not a de Polignac number, because 204388805 - 2² = 204388801 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204388801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20438876 + ... + 20438885.

It is an arithmetic number, because the mean of its divisors is an integer number (61316643).

Almost surely, 2^204388805 is an apocalyptic number.

It is an amenable number.

204388805 is a deficient number, since it is larger than the sum of its proper divisors (40877767).

204388805 is an equidigital number, since it uses as much as digits as its factorization.

204388805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40877766.

The product of its (nonzero) digits is 61440, while the sum is 38.

The square root of 204388805 is about 14296.4612754346. The cubic root of 204388805 is about 589.0502818917.

The spelling of 204388805 in words is "two hundred four million, three hundred eighty-eight thousand, eight hundred five".