20685418 has 16 divisors (see below), whose sum is σ = 34868736. Its totient is φ = 9131760.

The previous prime is 20685407. The next prime is 20685421. The reversal of 20685418 is 81458602.

It is an unprimeable number.

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, 16698 + ... + 17893.

It is an arithmetic number, because the mean of its divisors is an integer number (2179296).

Almost surely, 2^20685418 is an apocalyptic number.

20685418 is a deficient number, since it is larger than the sum of its proper divisors (14183318).

20685418 is a wasteful number, since it uses less digits than its factorization.

20685418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34629.

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 20685418 is about 4548.1224697671. The cubic root of 20685418 is about 274.5078492297.

The spelling of 20685418 in words is "twenty million, six hundred eighty-five thousand, four hundred eighteen".