20830186 has 32 divisors (see below), whose sum is σ = 35239680. Its totient is φ = 9170496.

The previous prime is 20830169. The next prime is 20830211. The reversal of 20830186 is 68103802.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56575 + ... + 56941.

It is an arithmetic number, because the mean of its divisors is an integer number (1101240).

Almost surely, 2^20830186 is an apocalyptic number.

20830186 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20830186 is a deficient number, since it is larger than the sum of its proper divisors (14409494).

20830186 is a wasteful number, since it uses less digits than its factorization.

20830186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 20830186 is about 4564.0098597615. The cubic root of 20830186 is about 275.1467470225.

Adding to 20830186 its reverse (68103802), we get a palindrome (88933988).

The spelling of 20830186 in words is "twenty million, eight hundred thirty thousand, one hundred eighty-six".