204155 has 16 divisors (see below), whose sum is σ = 295680. Its totient is φ = 132192.

The previous prime is 204151. The next prime is 204161. The reversal of 204155 is 551402.

204155 = T₂ + T₃ + ... + T₁₀₆.

It is a cyclic number.

It is not a de Polignac number, because 204155 - 2² = 204151 is a prime.

It is not an unprimeable number, because it can be changed into a prime (204151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 512 + ... + 818.

It is an arithmetic number, because the mean of its divisors is an integer number (18480).

2²⁰⁴¹⁵⁵ is an apocalyptic number.

204155 is a deficient number, since it is larger than the sum of its proper divisors (91525).

204155 is a wasteful number, since it uses less digits than its factorization.

204155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338.

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 204155 is about 451.8351469286. The cubic root of 204155 is about 58.8825586856.

Adding to 204155 its reverse (551402), we get a palindrome (755557).

The spelling of 204155 in words is "two hundred four thousand, one hundred fifty-five".