19985386826 has 8 divisors (see below), whose sum is σ = 31281475104. Its totient is φ = 9558228460.

The previous prime is 19985386777. The next prime is 19985386829. The reversal of 19985386826 is 62868358991.

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

It is not an unprimeable number, because it can be changed into a prime (19985386829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 217232420 + ... + 217232511.

It is an arithmetic number, because the mean of its divisors is an integer number (3910184388).

Almost surely, 2^19985386826 is an apocalyptic number.

19985386826 is a deficient number, since it is larger than the sum of its proper divisors (11296088278).

19985386826 is a wasteful number, since it uses less digits than its factorization.

19985386826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434464956.

The product of its digits is 44789760, while the sum is 65.

The spelling of 19985386826 in words is "nineteen billion, nine hundred eighty-five million, three hundred eighty-six thousand, eight hundred twenty-six".