20666618112 has 144 divisors (see below), whose sum is σ = 62926682112. Its totient is φ = 5898577920.

The previous prime is 20666618083. The next prime is 20666618197. The reversal of 20666618112 is 21181666602.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8444473 + ... + 8446919.

It is an arithmetic number, because the mean of its divisors is an integer number (436990848).

Almost surely, 2^20666618112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20666618112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31463341056).

20666618112 is an abundant number, since it is smaller than the sum of its proper divisors (42260064000).

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

20666618112 is a wasteful number, since it uses less digits than its factorization.

20666618112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4044 (or 4030 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 39.

The spelling of 20666618112 in words is "twenty billion, six hundred sixty-six million, six hundred eighteen thousand, one hundred twelve".