19909804 has 12 divisors (see below), whose sum is σ = 35093800. Its totient is φ = 9883008.

The previous prime is 19909793. The next prime is 19909823. The reversal of 19909804 is 40890991.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17349 + ... + 18460.

Almost surely, 2^19909804 is an apocalyptic number.

It is an amenable number.

19909804 is a deficient number, since it is larger than the sum of its proper divisors (15183996).

19909804 is a wasteful number, since it uses less digits than its factorization.

19909804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35952 (or 35950 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 19909804 is about 4462.0403404721. The cubic root of 19909804 is about 271.0330973588.

The spelling of 19909804 in words is "nineteen million, nine hundred nine thousand, eight hundred four".