Adding to 23520 its sum of digits (12), we get a palindrome (23532).
23520 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.
It is a nialpdrome in base 14.
It is a zygodrome in base 14.
It is a congruent number.
It is an unprimeable number.
23520 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
223520 is an apocalyptic number.
23520 is a gapful number since it is divisible by the number (20) 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 23520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43092).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
23520 is a wasteful number, since it uses less digits than its factorization.
23520 is an evil number, because the sum of its binary digits is even.
The square root of 23520 is about 153.3623161014. The cubic root of 23520 is about 28.6513950266.
The spelling of 23520 in words is "twenty-three thousand, five hundred twenty".