19660000 has 60 divisors (see below), whose sum is σ = 48415752. Its totient is φ = 7856000.

The previous prime is 19659989. The next prime is 19660001. The reversal of 19660000 is 6691.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19660001) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 19509 + ... + 20491.

Almost surely, 2^19660000 is an apocalyptic number.

19660000 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 19660000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24207876).

19660000 is an abundant number, since it is smaller than the sum of its proper divisors (28755752).

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

19660000 is an frugal number, since it uses more digits than its factorization.

19660000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1013 (or 990 counting only the distinct ones).

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

The square root of 19660000 is about 4433.9598554791. The cubic root of 19660000 is about 269.8947921149.

Adding to 19660000 its reverse (6691), we get a palindrome (19666691).

The spelling of 19660000 in words is "nineteen million, six hundred sixty thousand".