20168516687 has 8 divisors (see below), whose sum is σ = 22133768832. Its totient is φ = 18225223000.

The previous prime is 20168516671. The next prime is 20168516749. The reversal of 20168516687 is 78661586102.

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 20168516687 - 2⁴ = 20168516671 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 (20168516617) 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, 5487689 + ... + 5491362.

It is an arithmetic number, because the mean of its divisors is an integer number (2766721104).

Almost surely, 2^20168516687 is an apocalyptic number.

20168516687 is a deficient number, since it is larger than the sum of its proper divisors (1965252145).

20168516687 is a wasteful number, since it uses less digits than its factorization.

20168516687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10979229.

The product of its (nonzero) digits is 967680, while the sum is 50.

The spelling of 20168516687 in words is "twenty billion, one hundred sixty-eight million, five hundred sixteen thousand, six hundred eighty-seven".