20186685 has 16 divisors (see below), whose sum is σ = 35887680. Its totient is φ = 10766160.

The previous prime is 20186653. The next prime is 20186687. The reversal of 20186685 is 58668102.

It is a happy number.

It is not a de Polignac number, because 20186685 - 2⁵ = 20186653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20186687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74631 + ... + 74900.

It is an arithmetic number, because the mean of its divisors is an integer number (2242980).

Almost surely, 2^20186685 is an apocalyptic number.

It is an amenable number.

20186685 is a deficient number, since it is larger than the sum of its proper divisors (15700995).

20186685 is a wasteful number, since it uses less digits than its factorization.

20186685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149545 (or 149539 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 20186685 is about 4492.9594923614. The cubic root of 20186685 is about 272.2837158193.

The spelling of 20186685 in words is "twenty million, one hundred eighty-six thousand, six hundred eighty-five".