Adding to 20201 its reverse (10202), we get a palindrome (30403).
Subtracting from 20201 its reverse (10202), we obtain a palindrome (9999).
Multipling 20201 by its reverse (10202), we get a palindrome (206090602).
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-20201 is a prime.
It is a Chen prime.
It is an Ulam number.
It is a congruent number.
220201 is an apocalyptic number.
20201 is the 101-st centered square number.
It is an amenable number.
20201 is an equidigital number, since it uses as much as digits as its factorization.
20201 is an odious number, because the sum of its binary digits is odd.
The square root of 20201 is about 142.1302219797. The cubic root of 20201 is about 27.2348062201.
The spelling of 20201 in words is "twenty thousand, two hundred one", and thus it is an iban number.