204720 has 40 divisors (see below), whose sum is σ = 635376. Its totient is φ = 54528.

The previous prime is 204719. The next prime is 204733. The reversal of 204720 is 27402.

204720 = T₇₂ + T₇₃ + ... + T₁₁₆.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 204720.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 187 + ... + 666.

2²⁰⁴⁷²⁰ is an apocalyptic number.

204720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204720 is an abundant number, since it is smaller than the sum of its proper divisors (430656).

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

204720 is a wasteful number, since it uses less digits than its factorization.

204720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869 (or 863 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 15.

The square root of 204720 is about 452.4599429784. The cubic root of 204720 is about 58.9368279130.

The spelling of 204720 in words is "two hundred four thousand, seven hundred twenty", and thus it is an iban number.