20032218 has 48 divisors (see below), whose sum is σ = 46820160. Its totient is φ = 6336792.

The previous prime is 20032193. The next prime is 20032237. The reversal of 20032218 is 81223002.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 20032218.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 157671 + ... + 157797.

It is an arithmetic number, because the mean of its divisors is an integer number (975420).

Almost surely, 2^20032218 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20032218, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23410080).

20032218 is an abundant number, since it is smaller than the sum of its proper divisors (26787942).

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

20032218 is a wasteful number, since it uses less digits than its factorization.

20032218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288 (or 155 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 20032218 is about 4475.7365874233. The cubic root of 20032218 is about 271.5874386417.

The spelling of 20032218 in words is "twenty million, thirty-two thousand, two hundred eighteen".