20660664006 has 20 divisors (see below), whose sum is σ = 46295191932. Its totient is φ = 6886887948.

The previous prime is 20660664001. The next prime is 20660664019. The reversal of 20660664006 is 60046606602.

20660664006 is a `hidden beast` number, since 2 + 0 + 6 + 6 + 0 + 6 + 640 + 0 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20660664001) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 63767320 + ... + 63767643.

Almost surely, 2^20660664006 is an apocalyptic number.

20660664006 is an abundant number, since it is smaller than the sum of its proper divisors (25634527926).

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

20660664006 is a wasteful number, since it uses less digits than its factorization.

20660664006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127534977 (or 127534968 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The spelling of 20660664006 in words is "twenty billion, six hundred sixty million, six hundred sixty-four thousand, six".