19985365 has 16 divisors (see below), whose sum is σ = 25061760. Its totient is φ = 15284160.

The previous prime is 19985351. The next prime is 19985401. The reversal of 19985365 is 56358991.

It is not a de Polignac number, because 19985365 - 2⁵ = 19985333 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10000 + ... + 11830.

It is an arithmetic number, because the mean of its divisors is an integer number (1566360).

Almost surely, 2^19985365 is an apocalyptic number.

It is an amenable number.

19985365 is a deficient number, since it is larger than the sum of its proper divisors (5076395).

19985365 is a wasteful number, since it uses less digits than its factorization.

19985365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1932.

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

The square root of 19985365 is about 4470.4994128173. The cubic root of 19985365 is about 271.3755363337.

The spelling of 19985365 in words is "nineteen million, nine hundred eighty-five thousand, three hundred sixty-five".