20567189 has 2 divisors, whose sum is σ = 20567190. Its totient is φ = 20567188.

The previous prime is 20567171. The next prime is 20567203. The reversal of 20567189 is 98176502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18992164 + 1575025 = 4358^2 + 1255^2 .

It is a cyclic number.

It is not a de Polignac number, because 20567189 - 2¹⁶ = 20501653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20567159) 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, 10283594 + 10283595.

It is an arithmetic number, because the mean of its divisors is an integer number (10283595).

Almost surely, 2^20567189 is an apocalyptic number.

It is an amenable number.

20567189 is a deficient number, since it is larger than the sum of its proper divisors (1).

20567189 is an equidigital number, since it uses as much as digits as its factorization.

20567189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 20567189 is about 4535.1062832088. The cubic root of 20567189 is about 273.9838598481.

The spelling of 20567189 in words is "twenty million, five hundred sixty-seven thousand, one hundred eighty-nine".