19804806 has 24 divisors (see below), whose sum is σ = 49040784. Its totient is φ = 5658480.

The previous prime is 19804801. The next prime is 19804819. The reversal of 19804806 is 60840891.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19804801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 78465 + ... + 78716.

It is an arithmetic number, because the mean of its divisors is an integer number (2043366).

Almost surely, 2^19804806 is an apocalyptic number.

19804806 is an abundant number, since it is smaller than the sum of its proper divisors (29235978).

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

19804806 is a wasteful number, since it uses less digits than its factorization.

19804806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157196 (or 157193 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 19804806 is about 4450.2590935810. The cubic root of 19804806 is about 270.5558097825. Note that the first 3 decimals are identical.

It can be divided in two parts, 1980 and 4806, that added together give a triangular number (6786 = T₁₁₆).

The spelling of 19804806 in words is "nineteen million, eight hundred four thousand, eight hundred six".