20004304657663 has 16 divisors (see below), whose sum is σ = 21136799692800. Its totient is φ = 18879786128160.

The previous prime is 20004304657639. The next prime is 20004304657699. The reversal of 20004304657663 is 36675640340002.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20004304657663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20004304657063) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57903345 + ... + 58247797.

It is an arithmetic number, because the mean of its divisors is an integer number (1321049980800).

Almost surely, 2^{20004304657663} is an apocalyptic number.

20004304657663 is a deficient number, since it is larger than the sum of its proper divisors (1132495035137).

20004304657663 is a wasteful number, since it uses less digits than its factorization.

20004304657663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356022.

The product of its (nonzero) digits is 2177280, while the sum is 46.

Adding to 20004304657663 its reverse (36675640340002), we get a palindrome (56679944997665).

The spelling of 20004304657663 in words is "twenty trillion, four billion, three hundred four million, six hundred fifty-seven thousand, six hundred sixty-three".