204440 has 32 divisors (see below), whose sum is σ = 486000. Its totient is φ = 77184.

The previous prime is 204439. The next prime is 204443. The reversal of 204440 is 44402.

204440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204443) 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, 626 + ... + 894.

2²⁰⁴⁴⁴⁰ is an apocalyptic number.

204440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 204440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (243000).

204440 is an abundant number, since it is smaller than the sum of its proper divisors (281560).

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

204440 is a wasteful number, since it uses less digits than its factorization.

204440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299 (or 295 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 14.

The square root of 204440 is about 452.1504174498. The cubic root of 204440 is about 58.9099459262.

Adding to 204440 its reverse (44402), we get a palindrome (248842).

The spelling of 204440 in words is "two hundred four thousand, four hundred forty", and thus it is an iban number.