204085881 has 24 divisors (see below), whose sum is σ = 304519176. Its totient is φ = 131639040.

The previous prime is 204085873. The next prime is 204085907. The reversal of 204085881 is 188580402.

It can be written as a sum of positive squares in 4 ways, for example, as 49829481 + 154256400 = 7059^2 + 12420^2 .

It is not a de Polignac number, because 204085881 - 2³ = 204085873 is a prime.

It is a super-2 number, since 2×204085881² = 83302093647092322, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (204085481) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 31891 + ... + 37751.

It is an arithmetic number, because the mean of its divisors is an integer number (12688299).

Almost surely, 2^204085881 is an apocalyptic number.

It is an amenable number.

204085881 is a deficient number, since it is larger than the sum of its proper divisors (100433295).

204085881 is a wasteful number, since it uses less digits than its factorization.

204085881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5993 (or 5990 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 36.

The square root of 204085881 is about 14285.8629770833. The cubic root of 204085881 is about 588.7591281531.

The spelling of 204085881 in words is "two hundred four million, eighty-five thousand, eight hundred eighty-one".