20688004558167 has 16 divisors (see below), whose sum is σ = 28648864702080. Its totient is φ = 13263363260000.

The previous prime is 20688004558163. The next prime is 20688004558181. The reversal of 20688004558167 is 76185540088602.

It is a cyclic number.

It is not a de Polignac number, because 20688004558167 - 2² = 20688004558163 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20688004558167.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20688004558163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 473669709 + ... + 473713382.

It is an arithmetic number, because the mean of its divisors is an integer number (1790554043880).

Almost surely, 2^{20688004558167} is an apocalyptic number.

20688004558167 is a deficient number, since it is larger than the sum of its proper divisors (7960860143913).

20688004558167 is a wasteful number, since it uses less digits than its factorization.

20688004558167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 947383374.

The product of its (nonzero) digits is 25804800, while the sum is 60.

The spelling of 20688004558167 in words is "twenty trillion, six hundred eighty-eight billion, four million, five hundred fifty-eight thousand, one hundred sixty-seven".