Adding to 204120 its reverse (21402), we get a palindrome (225522).
204120 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.
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 204120.
It is an unprimeable number.
204120 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
2204120 is an apocalyptic number.
204120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 204120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (393480).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
204120 is an equidigital number, since it uses as much as digits as its factorization.
204120 is an odious number, because the sum of its binary digits is odd.
The square root of 204120 is about 451.7964143284. The cubic root of 204120 is about 58.8791935834.
The spelling of 204120 in words is "two hundred four thousand, one hundred twenty", and thus it is an iban number.