20916767678587 has 16 divisors (see below), whose sum is σ = 22879128222720. Its totient is φ = 18964576964800.

The previous prime is 20916767678561. The next prime is 20916767678689. The reversal of 20916767678587 is 78587676761902.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20916767678587 is a prime.

It is a super-2 number, since 2×20916767678587² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20916767678987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13003239 + ... + 14523007.

It is an arithmetic number, because the mean of its divisors is an integer number (1429945513920).

Almost surely, 2^{20916767678587} is an apocalyptic number.

20916767678587 is a deficient number, since it is larger than the sum of its proper divisors (1962360544133).

20916767678587 is a wasteful number, since it uses less digits than its factorization.

20916767678587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1523114.

The product of its (nonzero) digits is 2987228160, while the sum is 79.

The spelling of 20916767678587 in words is "twenty trillion, nine hundred sixteen billion, seven hundred sixty-seven million, six hundred seventy-eight thousand, five hundred eighty-seven".