20010217 has 2 divisors, whose sum is σ = 20010218. Its totient is φ = 20010216.

The previous prime is 20010209. The next prime is 20010223. The reversal of 20010217 is 71201002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12524521 + 7485696 = 3539^2 + 2736^2 .

It is a cyclic number.

It is not a de Polignac number, because 20010217 - 2³ = 20010209 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20010197 and 20010206.

It is not a weakly prime, because it can be changed into another prime (20010017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005108 + 10005109.

It is an arithmetic number, because the mean of its divisors is an integer number (10005109).

Almost surely, 2^20010217 is an apocalyptic number.

It is an amenable number.

20010217 is a deficient number, since it is larger than the sum of its proper divisors (1).

20010217 is an equidigital number, since it uses as much as digits as its factorization.

20010217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28, while the sum is 13.

The square root of 20010217 is about 4473.2781044777. The cubic root of 20010217 is about 271.4879757989.

Adding to 20010217 its reverse (71201002), we get a palindrome (91211219).

The spelling of 20010217 in words is "twenty million, ten thousand, two hundred seventeen".