Adding to 20224 its reverse (42202), we get a palindrome (62426).
It is a happy number.
It is a plaindrome in base 6.
It is a nialpdrome in base 12.
It is a self number, because there is not a number n which added to its sum of digits gives 20224.
It is a congruent number.
It is an unprimeable number.
220224 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 20224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20440).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20224 is an frugal number, since it uses more digits than its factorization.
20224 is an odious number, because the sum of its binary digits is odd.
The square root of 20224 is about 142.2111106770. The cubic root of 20224 is about 27.2451384308.
The spelling of 20224 in words is "twenty thousand, two hundred twenty-four", and thus it is an iban number.