The square root of 20736 is 144.
It is a Jordan-Polya number, since it can be written as (4!)2 ⋅ (3!)2.
20736 is nontrivially palindromic in base 11 and base 15.
It is an Ulam number.
It is a Duffinian number.
It is a nialpdrome in base 12 and base 16.
20736 is a Friedman number, since it can be written as (2*(6+0))^(7-3), using all its digits and the basic arithmetic operations.
220736 is an apocalyptic number.
20736 is the 144-th square number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 20736
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20736 is an frugal number, since it uses more digits than its factorization.
20736 is an odious number, because the sum of its binary digits is odd.
The cubic root of 20736 is about 27.4731418213.
Multiplying 20736 by its sum of digits (18), we get a cube (373248 = 723).
The spelling of 20736 in words is "twenty thousand, seven hundred thirty-six".