19981336 has 8 divisors (see below), whose sum is σ = 37465020. Its totient is φ = 9990664.

The previous prime is 19981333. The next prime is 19981361. The reversal of 19981336 is 63318991.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19981333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1248826 + ... + 1248841.

Almost surely, 2^19981336 is an apocalyptic number.

It is an amenable number.

19981336 is a deficient number, since it is larger than the sum of its proper divisors (17483684).

19981336 is a wasteful number, since it uses less digits than its factorization.

19981336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2497673 (or 2497669 counting only the distinct ones).

The product of its digits is 34992, while the sum is 40.

The square root of 19981336 is about 4470.0487693089. The cubic root of 19981336 is about 271.3572988965.

The spelling of 19981336 in words is "nineteen million, nine hundred eighty-one thousand, three hundred thirty-six".