20540017 has 2 divisors, whose sum is σ = 20540018. Its totient is φ = 20540016.

The previous prime is 20539997. The next prime is 20540053. The reversal of 20540017 is 71004502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20466576 + 73441 = 4524^2 + 271^2 .

It is a cyclic number.

It is not a de Polignac number, because 20540017 - 2¹¹ = 20537969 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20539976 and 20540003.

It is not a weakly prime, because it can be changed into another prime (20540417) 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, 10270008 + 10270009.

It is an arithmetic number, because the mean of its divisors is an integer number (10270009).

Almost surely, 2^20540017 is an apocalyptic number.

It is an amenable number.

20540017 is a deficient number, since it is larger than the sum of its proper divisors (1).

20540017 is an equidigital number, since it uses as much as digits as its factorization.

20540017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 20540017 is about 4532.1095529565. The cubic root of 20540017 is about 273.8631502667.

Adding to 20540017 its reverse (71004502), we get a palindrome (91544519).

The spelling of 20540017 in words is "twenty million, five hundred forty thousand, seventeen".