20215417 has 2 divisors, whose sum is σ = 20215418. Its totient is φ = 20215416.

The previous prime is 20215381. The next prime is 20215451. The reversal of 20215417 is 71451202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10949481 + 9265936 = 3309^2 + 3044^2 .

It is a cyclic number.

It is not a de Polignac number, because 20215417 - 2¹⁹ = 19691129 is a prime.

It is not a weakly prime, because it can be changed into another prime (20215457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10107708 + 10107709.

It is an arithmetic number, because the mean of its divisors is an integer number (10107709).

Almost surely, 2^20215417 is an apocalyptic number.

It is an amenable number.

20215417 is a deficient number, since it is larger than the sum of its proper divisors (1).

20215417 is an equidigital number, since it uses as much as digits as its factorization.

20215417 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 20215417 is about 4496.1558024606. The cubic root of 20215417 is about 272.4128363593.

Adding to 20215417 its reverse (71451202), we get a palindrome (91666619).

The spelling of 20215417 in words is "twenty million, two hundred fifteen thousand, four hundred seventeen".