20022217 has 4 divisors (see below), whose sum is σ = 20563396. Its totient is φ = 19481040.

The previous prime is 20022203. The next prime is 20022229. The reversal of 20022217 is 71222002.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9388096 + 10634121 = 3064^2 + 3261^2 .

It is a cyclic number.

It is not a de Polignac number, because 20022217 - 2⁷ = 20022089 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20022217.

It is not an unprimeable number, because it can be changed into a prime (20022017) 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, 270534 + ... + 270607.

It is an arithmetic number, because the mean of its divisors is an integer number (5140849).

Almost surely, 2^20022217 is an apocalyptic number.

It is an amenable number.

20022217 is a deficient number, since it is larger than the sum of its proper divisors (541179).

20022217 is an equidigital number, since it uses as much as digits as its factorization.

20022217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541178.

The product of its (nonzero) digits is 112, while the sum is 16.

The square root of 20022217 is about 4474.6192016752. The cubic root of 20022217 is about 271.5422348254.

Adding to 20022217 its reverse (71222002), we get a palindrome (91244219).

The spelling of 20022217 in words is "twenty million, twenty-two thousand, two hundred seventeen".