20666443312 has 40 divisors (see below), whose sum is σ = 42416521776. Its totient is φ = 9720815616.

The previous prime is 20666443309. The next prime is 20666443331. The reversal of 20666443312 is 21334466602.

It is a happy number.

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, 601543 + ... + 634969.

Almost surely, 2^20666443312 is an apocalyptic number.

It is an amenable number.

20666443312 is an abundant number, since it is smaller than the sum of its proper divisors (21750078464).

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

20666443312 is a wasteful number, since it uses less digits than its factorization.

20666443312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35725 (or 35719 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 37.

The spelling of 20666443312 in words is "twenty billion, six hundred sixty-six million, four hundred forty-three thousand, three hundred twelve".