20641166 has 32 divisors (see below), whose sum is σ = 39771648. Its totient is φ = 7809120.

The previous prime is 20641141. The next prime is 20641207. The reversal of 20641166 is 66114602.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent 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, 1721 + ... + 6651.

It is an arithmetic number, because the mean of its divisors is an integer number (1242864).

Almost surely, 2^20641166 is an apocalyptic number.

20641166 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20641166 is a deficient number, since it is larger than the sum of its proper divisors (19130482).

20641166 is a wasteful number, since it uses less digits than its factorization.

20641166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4976.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 20641166 is about 4543.2550005475. The cubic root of 20641166 is about 274.3119593201.

Adding to 20641166 its reverse (66114602), we get a palindrome (86755768).

The spelling of 20641166 in words is "twenty million, six hundred forty-one thousand, one hundred sixty-six".