20269889 has 2 divisors, whose sum is σ = 20269890. Its totient is φ = 20269888.

The previous prime is 20269871. The next prime is 20269901. The reversal of 20269889 is 98896202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10240000 + 10029889 = 3200^2 + 3167^2 .

It is a cyclic number.

It is not a de Polignac number, because 20269889 - 2⁸ = 20269633 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20269849) 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, 10134944 + 10134945.

It is an arithmetic number, because the mean of its divisors is an integer number (10134945).

Almost surely, 2^20269889 is an apocalyptic number.

It is an amenable number.

20269889 is a deficient number, since it is larger than the sum of its proper divisors (1).

20269889 is an equidigital number, since it uses as much as digits as its factorization.

20269889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 20269889 is about 4502.2093465320. The cubic root of 20269889 is about 272.6572960502.

The spelling of 20269889 in words is "twenty million, two hundred sixty-nine thousand, eight hundred eighty-nine".