20368516868687 has 8 divisors (see below), whose sum is σ = 21946310025696. Its totient is φ = 18792292878432.

The previous prime is 20368516868681. The next prime is 20368516868747. The reversal of 20368516868687 is 78686861586302.

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

It is a cyclic number.

It is not a de Polignac number, because 20368516868687 - 2⁴⁴ = 2776330824271 is a prime.

It is a super-2 number, since 2×20368516868687² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20368516868681) 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, 392264723 + ... + 392316644.

It is an arithmetic number, because the mean of its divisors is an integer number (2743288753212).

Almost surely, 2^{20368516868687} is an apocalyptic number.

20368516868687 is a deficient number, since it is larger than the sum of its proper divisors (1577793157009).

20368516868687 is a wasteful number, since it uses less digits than its factorization.

20368516868687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784583377.

The product of its (nonzero) digits is 1114767360, while the sum is 74.

The spelling of 20368516868687 in words is "twenty trillion, three hundred sixty-eight billion, five hundred sixteen million, eight hundred sixty-eight thousand, six hundred eighty-seven".