20040017 has 4 divisors (see below), whose sum is σ = 20049060. Its totient is φ = 20030976.

The previous prime is 20039993. The next prime is 20040049. The reversal of 20040017 is 71004002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 13608721 + 6431296 = 3689^2 + 2536^2 .

It is a cyclic number.

It is not a de Polignac number, because 20040017 - 2⁶ = 20039953 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20039983 and 20040010.

It is not an unprimeable number, because it can be changed into a prime (20040067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1313 + ... + 6465.

It is an arithmetic number, because the mean of its divisors is an integer number (5012265).

Almost surely, 2^20040017 is an apocalyptic number.

It is an amenable number.

20040017 is a deficient number, since it is larger than the sum of its proper divisors (9043).

20040017 is an equidigital number, since it uses as much as digits as its factorization.

20040017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9042.

The product of its (nonzero) digits is 56, while the sum is 14.

The square root of 20040017 is about 4476.6077558794. The cubic root of 20040017 is about 271.6226791331.

Adding to 20040017 its reverse (71004002), we get a palindrome (91044019).

The spelling of 20040017 in words is "twenty million, forty thousand, seventeen".