204020 has 18 divisors (see below), whose sum is σ = 432726. Its totient is φ = 80800.

The previous prime is 204019. The next prime is 204023. The reversal of 204020 is 20402.

204020 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 126736 + 77284 = 356^2 + 278^2 .

It is a junction number, because it is equal to n+sod(n) for n = 203989 and 204007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204023) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1970 + ... + 2070.

2²⁰⁴⁰²⁰ is an apocalyptic number.

204020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204020 is an abundant number, since it is smaller than the sum of its proper divisors (228706).

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

204020 is a wasteful number, since it uses less digits than its factorization.

204020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211 (or 108 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 8.

The square root of 204020 is about 451.6857314550. The cubic root of 204020 is about 58.8695768855.

Adding to 204020 its reverse (20402), we get a palindrome (224422).

The spelling of 204020 in words is "two hundred four thousand, twenty", and thus it is an iban number.