20500169 has 2 divisors, whose sum is σ = 20500170. Its totient is φ = 20500168.

The previous prime is 20500163. The next prime is 20500189. The reversal of 20500169 is 96100502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19245769 + 1254400 = 4387^2 + 1120^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20500169 is a prime.

It is a super-2 number, since 2×20500169² = 840513858057122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another 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, 10250084 + 10250085.

It is an arithmetic number, because the mean of its divisors is an integer number (10250085).

Almost surely, 2^20500169 is an apocalyptic number.

It is an amenable number.

20500169 is a deficient number, since it is larger than the sum of its proper divisors (1).

20500169 is an equidigital number, since it uses as much as digits as its factorization.

20500169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 20500169 is about 4527.7112319582. The cubic root of 20500169 is about 273.6859358158.

The spelling of 20500169 in words is "twenty million, five hundred thousand, one hundred sixty-nine".