20166866104 has 128 divisors (see below), whose sum is σ = 49766400000. Its totient is φ = 7585952640.

The previous prime is 20166866101. The next prime is 20166866119. The reversal of 20166866104 is 40166866102.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20166866101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 863817 + ... + 886855.

It is an arithmetic number, because the mean of its divisors is an integer number (388800000).

Almost surely, 2^20166866104 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 20166866104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24883200000).

20166866104 is an abundant number, since it is smaller than the sum of its proper divisors (29599533896).

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

20166866104 is a wasteful number, since it uses less digits than its factorization.

20166866104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23106 (or 23088 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 40.

The spelling of 20166866104 in words is "twenty billion, one hundred sixty-six million, eight hundred sixty-six thousand, one hundred four".