204490 has 36 divisors (see below), whose sum is σ = 438102. Its totient is φ = 68640.

The previous prime is 204487. The next prime is 204509. The reversal of 204490 is 94402.

It can be written as a sum of positive squares in 3 ways, for example, as 88209 + 116281 = 297^2 + 341^2 .

It is a Smith number, since the sum of its digits (19) coincides with the sum of the digits of its prime factors.

It is a nialpdrome in base 13.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 15724 + ... + 15736.

2²⁰⁴⁴⁹⁰ is an apocalyptic number.

204490 is an abundant number, since it is smaller than the sum of its proper divisors (233612).

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

204490 is a wasteful number, since it uses less digits than its factorization.

204490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55 (or 31 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 204490 is about 452.2057054041. The cubic root of 204490 is about 58.9147480804.

Adding to 204490 its reverse (94402), we get a palindrome (298892).

The spelling of 204490 in words is "two hundred four thousand, four hundred ninety".