19987496 has 32 divisors (see below), whose sum is σ = 39198600. Its totient is φ = 9542400.

The previous prime is 19987477. The next prime is 19987501. The reversal of 19987496 is 69478991.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 17522596 + 2464900 = 4186^2 + 1570^2 .

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 7 ways as a sum of consecutive naturals, for example, 23006 + ... + 23858.

Almost surely, 2^19987496 is an apocalyptic number.

It is an amenable number.

19987496 is a deficient number, since it is larger than the sum of its proper divisors (19211104).

19987496 is a wasteful number, since it uses less digits than its factorization.

19987496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 989 (or 985 counting only the distinct ones).

The product of its digits is 979776, while the sum is 53.

The square root of 19987496 is about 4470.7377467259. The cubic root of 19987496 is about 271.3851814034.

The spelling of 19987496 in words is "nineteen million, nine hundred eighty-seven thousand, four hundred ninety-six".