19987168 has 12 divisors (see below), whose sum is σ = 39349800. Its totient is φ = 9993568.

The previous prime is 19987159. The next prime is 19987169. The reversal of 19987168 is 86178991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19987169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312268 + ... + 312331.

It is an arithmetic number, because the mean of its divisors is an integer number (3279150).

Almost surely, 2^19987168 is an apocalyptic number.

It is an amenable number.

19987168 is a deficient number, since it is larger than the sum of its proper divisors (19362632).

19987168 is an equidigital number, since it uses as much as digits as its factorization.

19987168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624609 (or 624601 counting only the distinct ones).

The product of its digits is 217728, while the sum is 49.

The square root of 19987168 is about 4470.7010635917. The cubic root of 19987168 is about 271.3836968948.

The spelling of 19987168 in words is "nineteen million, nine hundred eighty-seven thousand, one hundred sixty-eight".