19985004 has 36 divisors (see below), whose sum is σ = 54404896. Its totient is φ = 6149088.

The previous prime is 19984969. The next prime is 19985023. The reversal of 19985004 is 40058991.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 19985004.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20884 + ... + 21819.

Almost surely, 2^19985004 is an apocalyptic number.

It is an amenable number.

19985004 is an abundant number, since it is smaller than the sum of its proper divisors (34419892).

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

19985004 is a wasteful number, since it uses less digits than its factorization.

19985004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42726 (or 42721 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 19985004 is about 4470.4590368328. The cubic root of 19985004 is about 271.3739023521.

The spelling of 19985004 in words is "nineteen million, nine hundred eighty-five thousand, four".