20490186 has 16 divisors (see below), whose sum is σ = 41090400. Its totient is φ = 6811728.

The previous prime is 20490181. The next prime is 20490191. The reversal of 20490186 is 68109402.

It is an interprime number because it is at equal distance from previous prime (20490181) and next prime (20490191).

It is not an unprimeable number, because it can be changed into a prime (20490181) by changing a digit.

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, 2056 + ... + 6723.

It is an arithmetic number, because the mean of its divisors is an integer number (2568150).

Almost surely, 2^20490186 is an apocalyptic number.

20490186 is an abundant number, since it is smaller than the sum of its proper divisors (20600214).

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

20490186 is a wasteful number, since it uses less digits than its factorization.

20490186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9173.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 20490186 is about 4526.6086643314. The cubic root of 20490186 is about 273.6415028436.

Adding to 20490186 its reverse (68109402), we get a palindrome (88599588).

The spelling of 20490186 in words is "twenty million, four hundred ninety thousand, one hundred eighty-six".