20975218 has 16 divisors (see below), whose sum is σ = 35816256. Its totient is φ = 9119440.

The previous prime is 20975203. The next prime is 20975219. The reversal of 20975218 is 81257902.

It is not an unprimeable number, because it can be changed into a prime (20975219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20221 + ... + 21232.

It is an arithmetic number, because the mean of its divisors is an integer number (2238516).

Almost surely, 2^20975218 is an apocalyptic number.

20975218 is a deficient number, since it is larger than the sum of its proper divisors (14841038).

20975218 is a wasteful number, since it uses less digits than its factorization.

20975218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41489.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 20975218 is about 4579.8709588808. The cubic root of 20975218 is about 275.7838484768.

The spelling of 20975218 in words is "twenty million, nine hundred seventy-five thousand, two hundred eighteen".