20143889 has 2 divisors, whose sum is σ = 20143890. Its totient is φ = 20143888.

The previous prime is 20143867. The next prime is 20143891. The reversal of 20143889 is 98834102.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14190289 + 5953600 = 3767^2 + 2440^2 .

It is a cyclic number.

It is not a de Polignac number, because 20143889 - 2⁸ = 20143633 is a prime.

Together with 20143891, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20143829) 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, 10071944 + 10071945.

It is an arithmetic number, because the mean of its divisors is an integer number (10071945).

Almost surely, 2^20143889 is an apocalyptic number.

It is an amenable number.

20143889 is a deficient number, since it is larger than the sum of its proper divisors (1).

20143889 is an equidigital number, since it uses as much as digits as its factorization.

20143889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 20143889 is about 4488.1944030980. The cubic root of 20143889 is about 272.0911648349.

The spelling of 20143889 in words is "twenty million, one hundred forty-three thousand, eight hundred eighty-nine".