20219218 has 16 divisors (see below), whose sum is σ = 30774240. Its totient is φ = 9962496.

The previous prime is 20219207. The next prime is 20219219. The reversal of 20219218 is 81291202.

It is a junction number, because it is equal to n+sod(n) for n = 20219192 and 20219201.

It is not an unprimeable number, because it can be changed into a prime (20219219) 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, 71305 + ... + 71587.

It is an arithmetic number, because the mean of its divisors is an integer number (1923390).

Almost surely, 2^20219218 is an apocalyptic number.

20219218 is a deficient number, since it is larger than the sum of its proper divisors (10555022).

20219218 is a wasteful number, since it uses less digits than its factorization.

20219218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 20219218 is about 4496.5784770201. The cubic root of 20219218 is about 272.4299087468.

The spelling of 20219218 in words is "twenty million, two hundred nineteen thousand, two hundred eighteen".