It is a plaindrome in base 14.
It is a congruent number.
20928 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
220928 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 20928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27940).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20928 is a wasteful number, since it uses less digits than its factorization.
20928 is an odious number, because the sum of its binary digits is odd.
The square root of 20928 is about 144.6651305602. The cubic root of 20928 is about 27.5576750981.
The spelling of 20928 in words is "twenty thousand, nine hundred twenty-eight".