20217226 has 4 divisors (see below), whose sum is σ = 30325842. Its totient is φ = 10108612.

The previous prime is 20217209. The next prime is 20217229. The reversal of 20217226 is 62271202.

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

It can be written as a sum of positive squares in only one way, i.e., 18071001 + 2146225 = 4251^2 + 1465^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 20217197 and 20217206.

It is not an unprimeable number, because it can be changed into a prime (20217229) by changing a digit.

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 as a sum of consecutive naturals, namely, 5054305 + ... + 5054308.

Almost surely, 2^20217226 is an apocalyptic number.

20217226 is a deficient number, since it is larger than the sum of its proper divisors (10108616).

20217226 is a wasteful number, since it uses less digits than its factorization.

20217226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10108615.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 20217226 is about 4496.3569698146. The cubic root of 20217226 is about 272.4209618429.

Adding to 20217226 its reverse (62271202), we get a palindrome (82488428).

The spelling of 20217226 in words is "twenty million, two hundred seventeen thousand, two hundred twenty-six".