20228218 has 8 divisors (see below), whose sum is σ = 30405600. Its totient is φ = 10093020.

The previous prime is 20228207. The next prime is 20228239. The reversal of 20228218 is 81282202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 20228192 and 20228201.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9318 + ... + 11281.

It is an arithmetic number, because the mean of its divisors is an integer number (3800700).

Almost surely, 2^20228218 is an apocalyptic number.

20228218 is a deficient number, since it is larger than the sum of its proper divisors (10177382).

20228218 is a wasteful number, since it uses less digits than its factorization.

20228218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21092.

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 20228218 is about 4497.5791265969. The cubic root of 20228218 is about 272.4703241819.

The spelling of 20228218 in words is "twenty million, two hundred twenty-eight thousand, two hundred eighteen".