20530889 has 2 divisors, whose sum is σ = 20530890. Its totient is φ = 20530888.

The previous prime is 20530871. The next prime is 20530891. The reversal of 20530889 is 98803502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20430400 + 100489 = 4520^2 + 317^2 .

It is a cyclic number.

It is not a de Polignac number, because 20530889 - 2¹⁶ = 20465353 is a prime.

Together with 20530891, 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 (20536889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10265444 + 10265445.

It is an arithmetic number, because the mean of its divisors is an integer number (10265445).

Almost surely, 2^20530889 is an apocalyptic number.

It is an amenable number.

20530889 is a deficient number, since it is larger than the sum of its proper divisors (1).

20530889 is an equidigital number, since it uses as much as digits as its factorization.

20530889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 20530889 is about 4531.1024044928. The cubic root of 20530889 is about 273.8225759213.

The spelling of 20530889 in words is "twenty million, five hundred thirty thousand, eight hundred eighty-nine".