19985266 has 16 divisors (see below), whose sum is σ = 35366400. Its totient is φ = 8288640.

The previous prime is 19985261. The next prime is 19985299. The reversal of 19985266 is 66258991.

It is not an unprimeable number, because it can be changed into a prime (19985261) 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, 22591 + ... + 23458.

It is an arithmetic number, because the mean of its divisors is an integer number (2210400).

Almost surely, 2^19985266 is an apocalyptic number.

19985266 is a deficient number, since it is larger than the sum of its proper divisors (15381134).

19985266 is a wasteful number, since it uses less digits than its factorization.

19985266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46089.

The product of its digits is 233280, while the sum is 46.

The square root of 19985266 is about 4470.4883402152. The cubic root of 19985266 is about 271.3750882354.

The spelling of 19985266 in words is "nineteen million, nine hundred eighty-five thousand, two hundred sixty-six".