20500166 has 4 divisors (see below), whose sum is σ = 30750252. Its totient is φ = 10250082.

The previous prime is 20500163. The next prime is 20500169. The reversal of 20500166 is 66100502.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20500163) and next prime (20500169).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20500163) 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 as a sum of consecutive naturals, namely, 5125040 + ... + 5125043.

It is an arithmetic number, because the mean of its divisors is an integer number (7687563).

Almost surely, 2^20500166 is an apocalyptic number.

20500166 is a deficient number, since it is larger than the sum of its proper divisors (10250086).

20500166 is a wasteful number, since it uses less digits than its factorization.

20500166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10250085.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 20500166 is about 4527.7109006649. The cubic root of 20500166 is about 273.6859224654.

Adding to 20500166 its reverse (66100502), we get a palindrome (86600668).

The spelling of 20500166 in words is "twenty million, five hundred thousand, one hundred sixty-six".