204871985 has 8 divisors (see below), whose sum is σ = 245933376. Its totient is φ = 163839600.

The previous prime is 204871967. The next prime is 204871987. The reversal of 204871985 is 589178402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 204871985 - 2¹⁶ = 204806449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204871987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13910 + ... + 24560.

It is an arithmetic number, because the mean of its divisors is an integer number (30741672).

Almost surely, 2^204871985 is an apocalyptic number.

It is an amenable number.

204871985 is a deficient number, since it is larger than the sum of its proper divisors (41061391).

204871985 is a wasteful number, since it uses less digits than its factorization.

204871985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14503.

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

The square root of 204871985 is about 14313.3498874303. The cubic root of 204871985 is about 589.5140928925.

The spelling of 204871985 in words is "two hundred four million, eight hundred seventy-one thousand, nine hundred eighty-five".