Adding to 20496 its reverse (69402), we get a palindrome (89898).
20496 is nontrivially palindromic in base 15.
It is a nialpdrome in base 12.
It is an unprimeable number.
20496 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
220496 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 20496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30752).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20496 is a wasteful number, since it uses less digits than its factorization.
20496 is an odious number, because the sum of its binary digits is odd.
The square root of 20496 is about 143.1642413454. The cubic root of 20496 is about 27.3667381920.
The spelling of 20496 in words is "twenty thousand, four hundred ninety-six".