20105185 has 8 divisors (see below), whose sum is σ = 24163776. Its totient is φ = 16059120.

The previous prime is 20105147. The next prime is 20105191. The reversal of 20105185 is 58150102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20105185 - 2¹¹ = 20103137 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 870 + ... + 6400.

It is an arithmetic number, because the mean of its divisors is an integer number (3020472).

Almost surely, 2^20105185 is an apocalyptic number.

It is an amenable number.

20105185 is a deficient number, since it is larger than the sum of its proper divisors (4058591).

20105185 is an equidigital number, since it uses as much as digits as its factorization.

20105185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6263.

The product of its (nonzero) digits is 400, while the sum is 22.

The square root of 20105185 is about 4483.8805737887. The cubic root of 20105185 is about 271.9167898945.

Adding to 20105185 its reverse (58150102), we get a palindrome (78255287).

The spelling of 20105185 in words is "twenty million, one hundred five thousand, one hundred eighty-five".