19985265 has 32 divisors (see below), whose sum is σ = 35717760. Its totient is φ = 10602432.

The previous prime is 19985261. The next prime is 19985299. The reversal of 19985265 is 56258991.

It is not a de Polignac number, because 19985265 - 2² = 19985261 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 19985265.

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 31 ways as a sum of consecutive naturals, for example, 42562 + ... + 43028.

It is an arithmetic number, because the mean of its divisors is an integer number (1116180).

Almost surely, 2^19985265 is an apocalyptic number.

19985265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19985265 is a deficient number, since it is larger than the sum of its proper divisors (15732495).

19985265 is a wasteful number, since it uses less digits than its factorization.

19985265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 798 (or 792 counting only the distinct ones).

The product of its digits is 194400, while the sum is 45.

The square root of 19985265 is about 4470.4882283706. The cubic root of 19985265 is about 271.3750837092.

The spelling of 19985265 in words is "nineteen million, nine hundred eighty-five thousand, two hundred sixty-five".