20166804 has 72 divisors (see below), whose sum is σ = 59055360. Its totient is φ = 5683392.

The previous prime is 20166781. The next prime is 20166821. The reversal of 20166804 is 40866102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19402 + ... + 20414.

Almost surely, 2^20166804 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 20166804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29527680).

20166804 is an abundant number, since it is smaller than the sum of its proper divisors (38888556).

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

20166804 is a wasteful number, since it uses less digits than its factorization.

20166804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1109 (or 1104 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 20166804 is about 4490.7464858306. The cubic root of 20166804 is about 272.1942996087.

The spelling of 20166804 in words is "twenty million, one hundred sixty-six thousand, eight hundred four".