20865085 has 16 divisors (see below), whose sum is σ = 25655040. Its totient is φ = 16286400.

The previous prime is 20865083. The next prime is 20865109. The reversal of 20865085 is 58056802.

It is not a de Polignac number, because 20865085 - 2¹ = 20865083 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20865085.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20865083) 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 15 ways as a sum of consecutive naturals, for example, 39634 + ... + 40156.

It is an arithmetic number, because the mean of its divisors is an integer number (1603440).

Almost surely, 2^20865085 is an apocalyptic number.

It is an amenable number.

20865085 is a deficient number, since it is larger than the sum of its proper divisors (4789955).

20865085 is a wasteful number, since it uses less digits than its factorization.

20865085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 708.

The product of its (nonzero) digits is 19200, while the sum is 34.

The square root of 20865085 is about 4567.8315424280. The cubic root of 20865085 is about 275.3003220426.

The spelling of 20865085 in words is "twenty million, eight hundred sixty-five thousand, eighty-five".