20406017 has 2 divisors, whose sum is σ = 20406018. Its totient is φ = 20406016.

The previous prime is 20406011. The next prime is 20406107. The reversal of 20406017 is 71060402.

Together with next prime (20406107) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19149376 + 1256641 = 4376^2 + 1121^2 .

It is a cyclic number.

It is not a de Polignac number, because 20406017 - 2⁶ = 20405953 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20406017.

It is not a weakly prime, because it can be changed into another prime (20406011) 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, 10203008 + 10203009.

It is an arithmetic number, because the mean of its divisors is an integer number (10203009).

Almost surely, 2^20406017 is an apocalyptic number.

It is an amenable number.

20406017 is a deficient number, since it is larger than the sum of its proper divisors (1).

20406017 is an equidigital number, since it uses as much as digits as its factorization.

20406017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 20406017 is about 4517.3019602413. The cubic root of 20406017 is about 273.2663030491.

Adding to 20406017 its reverse (71060402), we get a palindrome (91466419).

The spelling of 20406017 in words is "twenty million, four hundred six thousand, seventeen".