20218227 has 4 divisors (see below), whose sum is σ = 26957640. Its totient is φ = 13478816.

The previous prime is 20218193. The next prime is 20218259. The reversal of 20218227 is 72281202.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20218227 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20218197 and 20218206.

It is not an unprimeable number, because it can be changed into a prime (20218027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3369702 + ... + 3369707.

It is an arithmetic number, because the mean of its divisors is an integer number (6739410).

Almost surely, 2^20218227 is an apocalyptic number.

20218227 is a deficient number, since it is larger than the sum of its proper divisors (6739413).

20218227 is an equidigital number, since it uses as much as digits as its factorization.

20218227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6739412.

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 20218227 is about 4496.4682807733. The cubic root of 20218227 is about 272.4254578254.

Adding to 20218227 its reverse (72281202), we get a palindrome (92499429).

The spelling of 20218227 in words is "twenty million, two hundred eighteen thousand, two hundred twenty-seven".