20004304356517 has 8 divisors (see below), whose sum is σ = 21597361732856. Its totient is φ = 18418999084992.

The previous prime is 20004304356503. The next prime is 20004304356557. The reversal of 20004304356517 is 71565340340002.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1007947729156 + 18996356627361 = 1003966^2 + 4358481^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20004304356517 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20004304356517.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20004304356557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1938020838 + ... + 1938031159.

It is an arithmetic number, because the mean of its divisors is an integer number (2699670216607).

Almost surely, 2^{20004304356517} is an apocalyptic number.

It is an amenable number.

20004304356517 is a deficient number, since it is larger than the sum of its proper divisors (1593057376339).

20004304356517 is a wasteful number, since it uses less digits than its factorization.

20004304356517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3876052407.

The product of its (nonzero) digits is 302400, while the sum is 40.

Adding to 20004304356517 its reverse (71565340340002), we get a palindrome (91569644696519).

The spelling of 20004304356517 in words is "twenty trillion, four billion, three hundred four million, three hundred fifty-six thousand, five hundred seventeen".