19805804 has 24 divisors (see below), whose sum is σ = 35858928. Its totient is φ = 9564480.

The previous prime is 19805801. The next prime is 19805831. The reversal of 19805804 is 40850891.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (19805801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23714 + ... + 24534.

It is an arithmetic number, because the mean of its divisors is an integer number (1494122).

Almost surely, 2^19805804 is an apocalyptic number.

It is an amenable number.

19805804 is a deficient number, since it is larger than the sum of its proper divisors (16053124).

19805804 is a wasteful number, since it uses less digits than its factorization.

19805804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1025 (or 1023 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 19805804 is about 4450.3712204714. The cubic root of 19805804 is about 270.5603543051.

The spelling of 19805804 in words is "nineteen million, eight hundred five thousand, eight hundred four".