It is a nialpdrome in base 12.
220544 is an apocalyptic number.
20544 is a gapful number since it is divisible by the number (24) 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 20544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27432).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20544 is a wasteful number, since it uses less digits than its factorization.
20544 is an odious number, because the sum of its binary digits is odd.
The square root of 20544 is about 143.3317829374. The cubic root of 20544 is about 27.3880851103.
The spelling of 20544 in words is "twenty thousand, five hundred forty-four".