19909104889444 has 27 divisors (see below), whose sum is σ = 35058554402067. Its totient is φ = 9892758732984.

The previous prime is 19909104889417. The next prime is 19909104889477. The reversal of 19909104889444 is 44498840190991.

The square root of 19909104889444 is 4461962.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1454592769 + ... + 1454606455.

Almost surely, 2^{19909104889444} is an apocalyptic number.

19909104889444 is the 4461962-nd square number.

It is an amenable number.

19909104889444 is a deficient number, since it is larger than the sum of its proper divisors (15149449512623).

19909104889444 is an frugal number, since it uses more digits than its factorization.

19909104889444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27704 (or 13852 counting only the distinct ones).

The product of its (nonzero) digits is 107495424, while the sum is 70.

The spelling of 19909104889444 in words is "nineteen trillion, nine hundred nine billion, one hundred four million, eight hundred eighty-nine thousand, four hundred forty-four".