204870 has 16 divisors (see below), whose sum is σ = 491760. Its totient is φ = 54624.

The previous prime is 204859. The next prime is 204871. The reversal of 204870 is 78402.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204871) by changing a digit.

204870 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3385 + ... + 3444.

It is an arithmetic number, because the mean of its divisors is an integer number (30735).

2²⁰⁴⁸⁷⁰ is an apocalyptic number.

204870 is an abundant number, since it is smaller than the sum of its proper divisors (286890).

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

204870 is a wasteful number, since it uses less digits than its factorization.

204870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6839.

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 204870 is about 452.6256731561. The cubic root of 204870 is about 58.9512188957.

The spelling of 204870 in words is "two hundred four thousand, eight hundred seventy".