19886904 has 64 divisors (see below), whose sum is σ = 57657600. Its totient is φ = 6339168.

The previous prime is 19886891. The next prime is 19886947. The reversal of 19886904 is 40968891.

It is a self number, because there is not a number n which added to its sum of digits gives 19886904.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2967 + ... + 6969.

It is an arithmetic number, because the mean of its divisors is an integer number (900900).

Almost surely, 2^19886904 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 19886904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28828800).

19886904 is an abundant number, since it is smaller than the sum of its proper divisors (37770696).

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

19886904 is a wasteful number, since it uses less digits than its factorization.

19886904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4041 (or 4031 counting only the distinct ones).

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

The square root of 19886904 is about 4459.4735115258. The cubic root of 19886904 is about 270.9291445682.

The spelling of 19886904 in words is "nineteen million, eight hundred eighty-six thousand, nine hundred four".