20047889 has 2 divisors, whose sum is σ = 20047890. Its totient is φ = 20047888.

The previous prime is 20047871. The next prime is 20047891. The reversal of 20047889 is 98874002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14326225 + 5721664 = 3785^2 + 2392^2 .

It is a cyclic number.

It is not a de Polignac number, because 20047889 - 2⁸ = 20047633 is a prime.

Together with 20047891, 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 (20047189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10023944 + 10023945.

It is an arithmetic number, because the mean of its divisors is an integer number (10023945).

Almost surely, 2^20047889 is an apocalyptic number.

It is an amenable number.

20047889 is a deficient number, since it is larger than the sum of its proper divisors (1).

20047889 is an equidigital number, since it uses as much as digits as its factorization.

20047889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 20047889 is about 4477.4869067369. The cubic root of 20047889 is about 271.6582402110.

The spelling of 20047889 in words is "twenty million, forty-seven thousand, eight hundred eighty-nine".