20563189 has 2 divisors, whose sum is σ = 20563190. Its totient is φ = 20563188.

The previous prime is 20563163. The next prime is 20563237. The reversal of 20563189 is 98136502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11168964 + 9394225 = 3342^2 + 3065^2 .

It is a cyclic number.

It is not a de Polignac number, because 20563189 - 2¹⁷ = 20432117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20563129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10281594 + 10281595.

It is an arithmetic number, because the mean of its divisors is an integer number (10281595).

Almost surely, 2^20563189 is an apocalyptic number.

It is an amenable number.

20563189 is a deficient number, since it is larger than the sum of its proper divisors (1).

20563189 is an equidigital number, since it uses as much as digits as its factorization.

20563189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 20563189 is about 4534.6652577671. The cubic root of 20563189 is about 273.9660968228.

The spelling of 20563189 in words is "twenty million, five hundred sixty-three thousand, one hundred eighty-nine".