20720883866 has 16 divisors (see below), whose sum is σ = 31628713248. Its totient is φ = 10179546000.

The previous prime is 20720883847. The next prime is 20720883877. The reversal of 20720883866 is 66838802702.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 365060 + ... + 417983.

It is an arithmetic number, because the mean of its divisors is an integer number (1976794578).

Almost surely, 2^20720883866 is an apocalyptic number.

20720883866 is a deficient number, since it is larger than the sum of its proper divisors (10907829382).

20720883866 is a wasteful number, since it uses less digits than its factorization.

20720883866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 783277.

The product of its (nonzero) digits is 1548288, while the sum is 50.

The spelling of 20720883866 in words is "twenty billion, seven hundred twenty million, eight hundred eighty-three thousand, eight hundred sixty-six".