204109855 has 8 divisors (see below), whose sum is σ = 245421792. Its totient is φ = 162961248.

The previous prime is 204109853. The next prime is 204109901. The reversal of 204109855 is 558901402.

204109855 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 204109855 - 2¹ = 204109853 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 204109855.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204109853) 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, 38064 + ... + 43093.

It is an arithmetic number, because the mean of its divisors is an integer number (30677724).

Almost surely, 2^204109855 is an apocalyptic number.

204109855 is a deficient number, since it is larger than the sum of its proper divisors (41311937).

204109855 is an equidigital number, since it uses as much as digits as its factorization.

204109855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81665.

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 204109855 is about 14286.7020337095. The cubic root of 204109855 is about 588.7821811257.

The spelling of 204109855 in words is "two hundred four million, one hundred nine thousand, eight hundred fifty-five".