20881218 has 32 divisors (see below), whose sum is σ = 44271360. Its totient is φ = 6554240.

The previous prime is 20881181. The next prime is 20881229. The reversal of 20881218 is 81218802.

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, 5671 + ... + 8597.

It is an arithmetic number, because the mean of its divisors is an integer number (1383480).

Almost surely, 2^20881218 is an apocalyptic number.

20881218 is an abundant number, since it is smaller than the sum of its proper divisors (23390142).

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

20881218 is a wasteful number, since it uses less digits than its factorization.

20881218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3002.

The product of its (nonzero) digits is 2048, while the sum is 30.

The square root of 20881218 is about 4569.5971376041. The cubic root of 20881218 is about 275.3712583440.

The spelling of 20881218 in words is "twenty million, eight hundred eighty-one thousand, two hundred eighteen".