20730 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.
It is a plaindrome in base 14.
It is a nialpdrome in base 12 and base 15.
It is a zygodrome in base 4 and base 14.
20730 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
220730 is an apocalyptic number.
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20730 is a wasteful number, since it uses less digits than its factorization.
20730 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 701.
The square root of 20730 is about 143.9791651594. The cubic root of 20730 is about 27.4704917642.
The spelling of 20730 in words is "twenty thousand, seven hundred thirty".