19660 has 12 divisors (see below), whose sum is σ = 41328. Its totient is φ = 7856.

The previous prime is 19609. The next prime is 19661. The reversal of 19660 is 6691.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (19661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 472 + ... + 511.

It is an arithmetic number, because the mean of its divisors is an integer number (3444).

2¹⁹⁶⁶⁰ is an apocalyptic number.

19660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19660 is an abundant number, since it is smaller than the sum of its proper divisors (21668).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20664).

19660 is a wasteful number, since it uses less digits than its factorization.

19660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 992 (or 990 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 19660 is about 140.2141219706. The cubic root of 19660 is about 26.9894792115.

It can be divided in two parts, 196 and 60, that added together give a 8-th power (256 = 2⁸).

The spelling of 19660 in words is "nineteen thousand, six hundred sixty".