20211166 has 8 divisors (see below), whose sum is σ = 30340800. Its totient is φ = 10097568.

The previous prime is 20211157. The next prime is 20211167. The reversal of 20211166 is 66111202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91 + ... + 6358.

It is an arithmetic number, because the mean of its divisors is an integer number (3792600).

Almost surely, 2^20211166 is an apocalyptic number.

20211166 is a deficient number, since it is larger than the sum of its proper divisors (10129634).

20211166 is a wasteful number, since it uses less digits than its factorization.

20211166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8018.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 20211166 is about 4495.6830404289. The cubic root of 20211166 is about 272.3937402382.

Adding to 20211166 its reverse (66111202), we get a palindrome (86322368).

The spelling of 20211166 in words is "twenty million, two hundred eleven thousand, one hundred sixty-six".