19999885 has 8 divisors (see below), whose sum is σ = 24028056. Its totient is φ = 15981120.

The previous prime is 19999873. The next prime is 19999891. The reversal of 19999885 is 58899991.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1320201 + 18679684 = 1149^2 + 4322^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19999885 - 2⁹ = 19999373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 3795 + ... + 7375.

It is an arithmetic number, because the mean of its divisors is an integer number (3003507).

Almost surely, 2^19999885 is an apocalyptic number.

It is an amenable number.

19999885 is a deficient number, since it is larger than the sum of its proper divisors (4028171).

19999885 is a wasteful number, since it uses less digits than its factorization.

19999885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4703.

The product of its digits is 2099520, while the sum is 58.

The square root of 19999885 is about 4472.1230975902. The cubic root of 19999885 is about 271.4412413951.

The spelling of 19999885 in words is "nineteen million, nine hundred ninety-nine thousand, eight hundred eighty-five".