20664122208 has 48 divisors (see below), whose sum is σ = 56601732096. Its totient is φ = 6588560000.

The previous prime is 20664122207. The next prime is 20664122243. The reversal of 20664122208 is 80222146602.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20664122203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4677168 + ... + 4681583.

It is an arithmetic number, because the mean of its divisors is an integer number (1179202752).

Almost surely, 2^20664122208 is an apocalyptic number.

It is an amenable number.

20664122208 is an abundant number, since it is smaller than the sum of its proper divisors (35937609888).

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

20664122208 is a wasteful number, since it uses less digits than its factorization.

20664122208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9358787 (or 9358779 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 33.

The spelling of 20664122208 in words is "twenty billion, six hundred sixty-four million, one hundred twenty-two thousand, two hundred eight".