20500165 has 16 divisors (see below), whose sum is σ = 28310400. Its totient is φ = 13959360.

The previous prime is 20500163. The next prime is 20500169. The reversal of 20500165 is 56100502.

It is a happy number.

It is not a de Polignac number, because 20500165 - 2¹ = 20500163 is a prime.

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 in 15 ways as a sum of consecutive naturals, for example, 3250 + ... + 7180.

It is an arithmetic number, because the mean of its divisors is an integer number (1769400).

Almost surely, 2^20500165 is an apocalyptic number.

It is an amenable number.

20500165 is a deficient number, since it is larger than the sum of its proper divisors (7810235).

20500165 is a wasteful number, since it uses less digits than its factorization.

20500165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4092.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 20500165 is about 4527.7107902338. The cubic root of 20500165 is about 273.6859180153.

Adding to 20500165 its reverse (56100502), we get a palindrome (76600667).

The spelling of 20500165 in words is "twenty million, five hundred thousand, one hundred sixty-five".