20316220866 has 24 divisors (see below), whose sum is σ = 44849017980. Its totient is φ = 6644298336.

The previous prime is 20316220843. The next prime is 20316220867. The reversal of 20316220866 is 66802261302.

20316220866 is a `hidden beast` number, since 20 + 3 + 1 + 622 + 0 + 8 + 6 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 19496257641 + 819963225 = 139629^2 + 28635^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20316220866.

It is not an unprimeable number, because it can be changed into a prime (20316220867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10646961 + ... + 10648868.

Almost surely, 2^20316220866 is an apocalyptic number.

20316220866 is an abundant number, since it is smaller than the sum of its proper divisors (24532797114).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20316220866 is a wasteful number, since it uses less digits than its factorization.

20316220866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21295890 (or 21295887 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The spelling of 20316220866 in words is "twenty billion, three hundred sixteen million, two hundred twenty thousand, eight hundred sixty-six".