20218226 has 24 divisors (see below), whose sum is σ = 35270784. Its totient is φ = 8514720.

The previous prime is 20218193. The next prime is 20218259. The reversal of 20218226 is 62281202.

It is an interprime number because it is at equal distance from previous prime (20218193) and next prime (20218259).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 74471 + ... + 74741.

It is an arithmetic number, because the mean of its divisors is an integer number (1469616).

Almost surely, 2^20218226 is an apocalyptic number.

20218226 is a deficient number, since it is larger than the sum of its proper divisors (15052558).

20218226 is an equidigital number, since it uses as much as digits as its factorization.

20218226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426 (or 353 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 20218226 is about 4496.4681695749. The cubic root of 20218226 is about 272.4254533340.

Adding to 20218226 its reverse (62281202), we get a palindrome (82499428).

The spelling of 20218226 in words is "twenty million, two hundred eighteen thousand, two hundred twenty-six".