20680186 has 4 divisors (see below), whose sum is σ = 31020282. Its totient is φ = 10340092.

The previous prime is 20680183. The next prime is 20680199. The reversal of 20680186 is 68108602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68108602 = 2 ⋅34054301.

It can be written as a sum of positive squares in only one way, i.e., 18020025 + 2660161 = 4245^2 + 1631^2 .

It is not an unprimeable number, because it can be changed into a prime (20680181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5170045 + ... + 5170048.

Almost surely, 2^20680186 is an apocalyptic number.

20680186 is a deficient number, since it is larger than the sum of its proper divisors (10340096).

20680186 is a wasteful number, since it uses less digits than its factorization.

20680186 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10340095.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 20680186 is about 4547.5472509915. The cubic root of 20680186 is about 274.4847033567.

Adding to 20680186 its reverse (68108602), we get a palindrome (88788788).

The spelling of 20680186 in words is "twenty million, six hundred eighty thousand, one hundred eighty-six".