204420 has 24 divisors (see below), whose sum is σ = 572544. Its totient is φ = 54496.

The previous prime is 204397. The next prime is 204427. The reversal of 204420 is 24402.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 204396 and 204405.

It is not an unprimeable number, because it can be changed into a prime (204427) by changing a digit.

204420 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, 1644 + ... + 1763.

It is an arithmetic number, because the mean of its divisors is an integer number (23856).

2²⁰⁴⁴²⁰ is an apocalyptic number.

204420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204420 is an abundant number, since it is smaller than the sum of its proper divisors (368124).

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

204420 is a wasteful number, since it uses less digits than its factorization.

204420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3419 (or 3417 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 12.

The square root of 204420 is about 452.1283003750. The cubic root of 204420 is about 58.9080248453.

Adding to 204420 its reverse (24402), we get a palindrome (228822).

The spelling of 204420 in words is "two hundred four thousand, four hundred twenty", and thus it is an iban number.