20500189 has 2 divisors, whose sum is σ = 20500190. Its totient is φ = 20500188.

The previous prime is 20500169. The next prime is 20500217. The reversal of 20500189 is 98100502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15288100 + 5212089 = 3910^2 + 2283^2 .

It is a cyclic number.

It is not a de Polignac number, because 20500189 - 2¹³ = 20491997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20500159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10250094 + 10250095.

It is an arithmetic number, because the mean of its divisors is an integer number (10250095).

Almost surely, 2^20500189 is an apocalyptic number.

It is an amenable number.

20500189 is a deficient number, since it is larger than the sum of its proper divisors (1).

20500189 is an equidigital number, since it uses as much as digits as its factorization.

20500189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 20500189 is about 4527.7134405790. The cubic root of 20500189 is about 273.6860248186.

The spelling of 20500189 in words is "twenty million, five hundred thousand, one hundred eighty-nine".