204163985 has 16 divisors (see below), whose sum is σ = 263900160. Its totient is φ = 151187520.

The previous prime is 204163961. The next prime is 204163997. The reversal of 204163985 is 589361402.

It is a happy number.

It is not a de Polignac number, because 204163985 - 2¹² = 204159889 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25070 + ... + 32199.

It is an arithmetic number, because the mean of its divisors is an integer number (16493760).

Almost surely, 2^204163985 is an apocalyptic number.

It is an amenable number.

204163985 is a deficient number, since it is larger than the sum of its proper divisors (59736175).

204163985 is a wasteful number, since it uses less digits than its factorization.

204163985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57328.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 204163985 is about 14288.5963271414. The cubic root of 204163985 is about 588.8342249340.

The spelling of 204163985 in words is "two hundred four million, one hundred sixty-three thousand, nine hundred eighty-five".