19919648 has 48 divisors (see below), whose sum is σ = 47464704. Its totient is φ = 8033280.

The previous prime is 19919623. The next prime is 19919651. The reversal of 19919648 is 84691991.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1193 + ... + 6423.

It is an arithmetic number, because the mean of its divisors is an integer number (988848).

Almost surely, 2^19919648 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19919648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23732352).

19919648 is an abundant number, since it is smaller than the sum of its proper divisors (27545056).

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

19919648 is a wasteful number, since it uses less digits than its factorization.

19919648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5265 (or 5257 counting only the distinct ones).

The product of its digits is 139968, while the sum is 47.

The square root of 19919648 is about 4463.1432869672. The cubic root of 19919648 is about 271.0777589437.

The spelling of 19919648 in words is "nineteen million, nine hundred nineteen thousand, six hundred forty-eight".