20161186 has 4 divisors (see below), whose sum is σ = 30241782. Its totient is φ = 10080592.

The previous prime is 20161157. The next prime is 20161199. The reversal of 20161186 is 68116102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19971961 + 189225 = 4469^2 + 435^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20161186.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5040295 + ... + 5040298.

Almost surely, 2^20161186 is an apocalyptic number.

20161186 is a deficient number, since it is larger than the sum of its proper divisors (10080596).

20161186 is a wasteful number, since it uses less digits than its factorization.

20161186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10080595.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 20161186 is about 4490.1209337834. The cubic root of 20161186 is about 272.1690216057.

Adding to 20161186 its reverse (68116102), we get a palindrome (88277288).

The spelling of 20161186 in words is "twenty million, one hundred sixty-one thousand, one hundred eighty-six".