19808144 has 20 divisors (see below), whose sum is σ = 38866560. Its totient is φ = 9778080.

The previous prime is 19808143. The next prime is 19808147. The reversal of 19808144 is 44180891.

It is not an unprimeable number, because it can be changed into a prime (19808141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6572 + ... + 9099.

It is an arithmetic number, because the mean of its divisors is an integer number (1943328).

Almost surely, 2^19808144 is an apocalyptic number.

It is an amenable number.

19808144 is a deficient number, since it is larger than the sum of its proper divisors (19058416).

19808144 is a wasteful number, since it uses less digits than its factorization.

19808144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15758 (or 15752 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 19808144 is about 4450.6341121238. The cubic root of 19808144 is about 270.5710092003.

The spelling of 19808144 in words is "nineteen million, eight hundred eight thousand, one hundred forty-four".