19987136 has 28 divisors (see below), whose sum is σ = 42714672. Its totient is φ = 9224448.

The previous prime is 19987129. The next prime is 19987151. The reversal of 19987136 is 63178991.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11180 + ... + 12843.

It is an arithmetic number, because the mean of its divisors is an integer number (1525524).

Almost surely, 2^19987136 is an apocalyptic number.

19987136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

19987136 is an abundant number, since it is smaller than the sum of its proper divisors (22727536).

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

19987136 is a wasteful number, since it uses less digits than its factorization.

19987136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24048 (or 24038 counting only the distinct ones).

The product of its digits is 81648, while the sum is 44.

The square root of 19987136 is about 4470.6974847332. The cubic root of 19987136 is about 271.3835520639.

The spelling of 19987136 in words is "nineteen million, nine hundred eighty-seven thousand, one hundred thirty-six".