20320189 has 2 divisors, whose sum is σ = 20320190. Its totient is φ = 20320188.

The previous prime is 20320187. The next prime is 20320211. The reversal of 20320189 is 98102302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17994564 + 2325625 = 4242^2 + 1525^2 .

It is a cyclic number.

It is not a de Polignac number, because 20320189 - 2¹ = 20320187 is a prime.

Together with 20320187, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20320187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160094 + 10160095.

It is an arithmetic number, because the mean of its divisors is an integer number (10160095).

Almost surely, 2^20320189 is an apocalyptic number.

It is an amenable number.

20320189 is a deficient number, since it is larger than the sum of its proper divisors (1).

20320189 is an equidigital number, since it uses as much as digits as its factorization.

20320189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 20320189 is about 4507.7920315826. The cubic root of 20320189 is about 272.8826439909.

The spelling of 20320189 in words is "twenty million, three hundred twenty thousand, one hundred eighty-nine".