20017218 has 32 divisors (see below), whose sum is σ = 43295616. Its totient is φ = 6133248.

The previous prime is 20017189. The next prime is 20017223. The reversal of 20017218 is 81271002.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20017194 and 20017203.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27171 + ... + 27897.

It is an arithmetic number, because the mean of its divisors is an integer number (1352988).

Almost surely, 2^20017218 is an apocalyptic number.

20017218 is an abundant number, since it is smaller than the sum of its proper divisors (23278398).

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

20017218 is a wasteful number, since it uses less digits than its factorization.

20017218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1098.

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 20017218 is about 4474.0605717849. The cubic root of 20017218 is about 271.5196340545.

The spelling of 20017218 in words is "twenty million, seventeen thousand, two hundred eighteen".