204971885 has 4 divisors (see below), whose sum is σ = 245966268. Its totient is φ = 163977504.

The previous prime is 204971869. The next prime is 204971887. The reversal of 204971885 is 588179402.

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 66227044 + 138744841 = 8138^2 + 11779^2 .

It is a cyclic number.

It is not a de Polignac number, because 204971885 - 2⁴ = 204971869 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 (204971887) 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, 20497184 + ... + 20497193.

It is an arithmetic number, because the mean of its divisors is an integer number (61491567).

Almost surely, 2^204971885 is an apocalyptic number.

It is an amenable number.

204971885 is a deficient number, since it is larger than the sum of its proper divisors (40994383).

204971885 is an equidigital number, since it uses as much as digits as its factorization.

204971885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40994382.

The product of its (nonzero) digits is 161280, while the sum is 44.

The square root of 204971885 is about 14316.8392112226. The cubic root of 204971885 is about 589.6098972522.

The spelling of 204971885 in words is "two hundred four million, nine hundred seventy-one thousand, eight hundred eighty-five".