20869856986 has 16 divisors (see below), whose sum is σ = 34154668800. Its totient is φ = 9485189280.

The previous prime is 20869856929. The next prime is 20869857053. The reversal of 20869856986 is 68965896802.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154615 + ... + 256213.

It is an arithmetic number, because the mean of its divisors is an integer number (2134666800).

Almost surely, 2^20869856986 is an apocalyptic number.

20869856986 is a deficient number, since it is larger than the sum of its proper divisors (13284811814).

20869856986 is a wasteful number, since it uses less digits than its factorization.

20869856986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110949.

The product of its (nonzero) digits is 89579520, while the sum is 67.

The spelling of 20869856986 in words is "twenty billion, eight hundred sixty-nine million, eight hundred fifty-six thousand, nine hundred eighty-six".