19985356 has 12 divisors (see below), whose sum is σ = 35453992. Its totient is φ = 9855648.

The previous prime is 19985351. The next prime is 19985401. The reversal of 19985356 is 65358991.

It is not an unprimeable number, because it can be changed into a prime (19985351) 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 3 ways as a sum of consecutive naturals, for example, 33930 + ... + 34513.

Almost surely, 2^19985356 is an apocalyptic number.

It is an amenable number.

19985356 is a deficient number, since it is larger than the sum of its proper divisors (15468636).

19985356 is a wasteful number, since it uses less digits than its factorization.

19985356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68520 (or 68518 counting only the distinct ones).

The product of its digits is 291600, while the sum is 46.

The square root of 19985356 is about 4470.4984062183. The cubic root of 19985356 is about 271.3754955976.

The spelling of 19985356 in words is "nineteen million, nine hundred eighty-five thousand, three hundred fifty-six".