19987268 has 12 divisors (see below), whose sum is σ = 39974592. Its totient is φ = 8565960.

The previous prime is 19987229. The next prime is 19987271. The reversal of 19987268 is 86278991.

19987268 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 356888 + ... + 356943.

It is an arithmetic number, because the mean of its divisors is an integer number (3331216).

Almost surely, 2^19987268 is an apocalyptic number.

It is an amenable number.

19987268 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

19987268 is a wasteful number, since it uses less digits than its factorization.

19987268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 713842 (or 713840 counting only the distinct ones).

The product of its digits is 435456, while the sum is 50.

The square root of 19987268 is about 4470.7122475060. The cubic root of 19987268 is about 271.3841494906.

The spelling of 19987268 in words is "nineteen million, nine hundred eighty-seven thousand, two hundred sixty-eight".