20817515332713 has 16 divisors (see below), whose sum is σ = 30283328060352. Its totient is φ = 12615298560000.

The previous prime is 20817515332703. The next prime is 20817515332723. The reversal of 20817515332713 is 31723351571802.

It is an interprime number because it is at equal distance from previous prime (20817515332703) and next prime (20817515332723).

It is not a de Polignac number, because 20817515332713 - 2¹⁰ = 20817515331689 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20817515332703) 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, 34128088 + ... + 34732713.

It is an arithmetic number, because the mean of its divisors is an integer number (1892708003772).

Almost surely, 2^{20817515332713} is an apocalyptic number.

It is an amenable number.

20817515332713 is a deficient number, since it is larger than the sum of its proper divisors (9465812727639).

20817515332713 is a wasteful number, since it uses less digits than its factorization.

20817515332713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68869976.

The product of its (nonzero) digits is 1058400, while the sum is 48.

The spelling of 20817515332713 in words is "twenty trillion, eight hundred seventeen billion, five hundred fifteen million, three hundred thirty-two thousand, seven hundred thirteen".