20028186 has 12 divisors (see below), whose sum is σ = 43394442. Its totient is φ = 6676056.

The previous prime is 20028181. The next prime is 20028209. The reversal of 20028186 is 68182002.

It can be written as a sum of positive squares in only one way, i.e., 19580625 + 447561 = 4425^2 + 669^2 .

It is a super-2 number, since 2×20028186² = 802256468901192, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20028181) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 556321 + ... + 556356.

Almost surely, 2^20028186 is an apocalyptic number.

20028186 is an abundant number, since it is smaller than the sum of its proper divisors (23366256).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20028186 is a wasteful number, since it uses less digits than its factorization.

20028186 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1112685 (or 1112682 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 20028186 is about 4475.2861361035. The cubic root of 20028186 is about 271.5692160960.

The spelling of 20028186 in words is "twenty million, twenty-eight thousand, one hundred eighty-six".