20004217 has 2 divisors, whose sum is σ = 20004218. Its totient is φ = 20004216.

The previous prime is 20004211. The next prime is 20004221. The reversal of 20004217 is 71240002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10169721 + 9834496 = 3189^2 + 3136^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20004217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20004217.

It is not a weakly prime, because it can be changed into another prime (20004211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10002108 + 10002109.

It is an arithmetic number, because the mean of its divisors is an integer number (10002109).

Almost surely, 2^20004217 is an apocalyptic number.

It is an amenable number.

20004217 is a deficient number, since it is larger than the sum of its proper divisors (1).

20004217 is an equidigital number, since it uses as much as digits as its factorization.

20004217 is an evil number, because the sum of its binary digits is even.

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

The square root of 20004217 is about 4472.6074050826. The cubic root of 20004217 is about 271.4608381506.

Adding to 20004217 its reverse (71240002), we get a palindrome (91244219).

The spelling of 20004217 in words is "twenty million, four thousand, two hundred seventeen".