19889064 has 96 divisors (see below), whose sum is σ = 60234720. Its totient is φ = 6111936.

The previous prime is 19889057. The next prime is 19889081. The reversal of 19889064 is 46098891.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24879 + ... + 25665.

It is an arithmetic number, because the mean of its divisors is an integer number (627445).

Almost surely, 2^19889064 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 19889064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30117360).

19889064 is an abundant number, since it is smaller than the sum of its proper divisors (40345656).

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

19889064 is a wasteful number, since it uses less digits than its factorization.

19889064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 821 (or 805 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 19889064 is about 4459.7156860051. The cubic root of 19889064 is about 270.9389531297.

The spelling of 19889064 in words is "nineteen million, eight hundred eighty-nine thousand, sixty-four".