20192789 has 2 divisors, whose sum is σ = 20192790. Its totient is φ = 20192788.

The previous prime is 20192779. The next prime is 20192803. The reversal of 20192789 is 98729102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14190289 + 6002500 = 3767^2 + 2450^2 .

It is a cyclic number.

It is not a de Polignac number, because 20192789 - 2⁴ = 20192773 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20192759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10096394 + 10096395.

It is an arithmetic number, because the mean of its divisors is an integer number (10096395).

Almost surely, 2^20192789 is an apocalyptic number.

It is an amenable number.

20192789 is a deficient number, since it is larger than the sum of its proper divisors (1).

20192789 is an equidigital number, since it uses as much as digits as its factorization.

20192789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 20192789 is about 4493.6387260215. The cubic root of 20192789 is about 272.3111572129.

The spelling of 20192789 in words is "twenty million, one hundred ninety-two thousand, seven hundred eighty-nine".