204871986 has 24 divisors (see below), whose sum is σ = 484243344. Its totient is φ = 62082360.

The previous prime is 204871967. The next prime is 204871987. The reversal of 204871986 is 689178402.

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 11 ways as a sum of consecutive naturals, for example, 517156 + ... + 517551.

It is an arithmetic number, because the mean of its divisors is an integer number (20176806).

Almost surely, 2^204871986 is an apocalyptic number.

204871986 is an abundant number, since it is smaller than the sum of its proper divisors (279371358).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

204871986 is a wasteful number, since it uses less digits than its factorization.

204871986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1034726 (or 1034723 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 204871986 is about 14313.3499223627. The cubic root of 204871986 is about 589.5140938516.

The spelling of 204871986 in words is "two hundred four million, eight hundred seventy-one thousand, nine hundred eighty-six".