20506166 has 8 divisors (see below), whose sum is σ = 30812400. Its totient is φ = 10235368.

The previous prime is 20506163. The next prime is 20506181. The reversal of 20506166 is 66160502.

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 (20506163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7361 + ... + 9756.

It is an arithmetic number, because the mean of its divisors is an integer number (3851550).

Almost surely, 2^20506166 is an apocalyptic number.

20506166 is a deficient number, since it is larger than the sum of its proper divisors (10306234).

20506166 is a wasteful number, since it uses less digits than its factorization.

20506166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17718.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 20506166 is about 4528.3734386643. The cubic root of 20506166 is about 273.7126207103.

Adding to 20506166 its reverse (66160502), we get a palindrome (86666668).

The spelling of 20506166 in words is "twenty million, five hundred six thousand, one hundred sixty-six".