20708046866 has 16 divisors (see below), whose sum is σ = 33487048728. Its totient is φ = 9547392000.

The previous prime is 20708046773. The next prime is 20708046883. The reversal of 20708046866 is 66864080702.

It can be written as a sum of positive squares in 4 ways, for example, as 20328771241 + 379275625 = 142579^2 + 19475^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20708046866.

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, 398735 + ... + 447666.

Almost surely, 2^20708046866 is an apocalyptic number.

20708046866 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20708046866 is a deficient number, since it is larger than the sum of its proper divisors (12779001862).

20708046866 is a wasteful number, since it uses less digits than its factorization.

20708046866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 847357.

The product of its (nonzero) digits is 774144, while the sum is 47.

The spelling of 20708046866 in words is "twenty billion, seven hundred eight million, forty-six thousand, eight hundred sixty-six".