20201166 has 12 divisors (see below), whose sum is σ = 43769232. Its totient is φ = 6733716.

The previous prime is 20201143. The next prime is 20201173. The reversal of 20201166 is 66110202.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1122287 = 20201166 / (2 + 0 + 2 + 0 + 1 + 1 + 6 + 6).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 561126 + ... + 561161.

It is an arithmetic number, because the mean of its divisors is an integer number (3647436).

Almost surely, 2^20201166 is an apocalyptic number.

20201166 is an abundant number, since it is smaller than the sum of its proper divisors (23568066).

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

20201166 is a wasteful number, since it uses less digits than its factorization.

20201166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1122295 (or 1122292 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 20201166 is about 4494.5707247745. The cubic root of 20201166 is about 272.3488081980.

Adding to 20201166 its reverse (66110202), we get a palindrome (86311368).

The spelling of 20201166 in words is "twenty million, two hundred one thousand, one hundred sixty-six".