205104 has 20 divisors (see below), whose sum is σ = 529976. Its totient is φ = 68352.

The previous prime is 205103. The next prime is 205111. The reversal of 205104 is 401502.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 205104.

It is not an unprimeable number, because it can be changed into a prime (205103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2089 + ... + 2184.

2²⁰⁵¹⁰⁴ is an apocalyptic number.

205104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

205104 is an abundant number, since it is smaller than the sum of its proper divisors (324872).

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

205104 is a wasteful number, since it uses less digits than its factorization.

205104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4284 (or 4278 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 205104 is about 452.8840911315. The cubic root of 205104 is about 58.9736548088.

Adding to 205104 its reverse (401502), we get a palindrome (606606).

The spelling of 205104 in words is "two hundred five thousand, one hundred four".