204560 has 20 divisors (see below), whose sum is σ = 475788. Its totient is φ = 81792.

The previous prime is 204557. The next prime is 204563. The reversal of 204560 is 65402.

It is an interprime number because it is at equal distance from previous prime (204557) and next prime (204563).

It can be written as a sum of positive squares in 2 ways, for example, as 80656 + 123904 = 284^2 + 352^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 204560.

It is not an unprimeable number, because it can be changed into a prime (204563) 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, 1199 + ... + 1358.

2²⁰⁴⁵⁶⁰ is an apocalyptic number.

204560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204560 is an abundant number, since it is smaller than the sum of its proper divisors (271228).

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

204560 is a wasteful number, since it uses less digits than its factorization.

204560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2570 (or 2564 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 204560 is about 452.2830971858. The cubic root of 204560 is about 58.9214697813.

Adding to 204560 its reverse (65402), we get a palindrome (269962).

The spelling of 204560 in words is "two hundred four thousand, five hundred sixty".