19804 has 6 divisors (see below), whose sum is σ = 34664. Its totient is φ = 9900.

The previous prime is 19801. The next prime is 19813. The reversal of 19804 is 40891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2472 + ... + 2479.

2¹⁹⁸⁰⁴ is an apocalyptic number.

It is an amenable number.

19804 is a deficient number, since it is larger than the sum of its proper divisors (14860).

19804 is a wasteful number, since it uses less digits than its factorization.

19804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4955 (or 4953 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 19804 is about 140.7266854580. The cubic root of 19804 is about 27.0552139445.

The spelling of 19804 in words is "nineteen thousand, eight hundred four".