It is a tau number, because it is divible by the number of its divisors (36).
It is an Ulam number.
It is a plaindrome in base 7.
It is a nialpdrome in base 12.
It is an unprimeable number.
19620 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
219620 is an apocalyptic number.
19620 is a gapful number since it is divisible by the number (10) 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 19620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30030).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
19620 is a wasteful number, since it uses less digits than its factorization.
19620 is an evil number, because the sum of its binary digits is even.
The square root of 19620 is about 140.0714103591. The cubic root of 19620 is about 26.9711626268.
The spelling of 19620 in words is "nineteen thousand, six hundred twenty".