20502 is nontrivially palindromic in base 10.
It is a plaindrome in base 11.
It is a nialpdrome in base 9 and base 13.
It is a congruent number.
20502 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
220502 is an apocalyptic number.
It is a practical number, because each smaller number is the sum of distinct divisors of 20502, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23868).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20502 is a wasteful number, since it uses less digits than its factorization.
20502 is an odious number, because the sum of its binary digits is odd.
The square root of 20502 is about 143.1851947654. The cubic root of 20502 is about 27.3694083782.
The spelling of 20502 in words is "twenty thousand, five hundred two".