20319589 has 2 divisors, whose sum is σ = 20319590. Its totient is φ = 20319588.

The previous prime is 20319587. The next prime is 20319599. The reversal of 20319589 is 98591302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11168964 + 9150625 = 3342^2 + 3025^2 .

It is a cyclic number.

It is not a de Polignac number, because 20319589 - 2¹ = 20319587 is a prime.

Together with 20319587, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20319581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10159794 + 10159795.

It is an arithmetic number, because the mean of its divisors is an integer number (10159795).

Almost surely, 2^20319589 is an apocalyptic number.

It is an amenable number.

20319589 is a deficient number, since it is larger than the sum of its proper divisors (1).

20319589 is an equidigital number, since it uses as much as digits as its factorization.

20319589 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 20319589 is about 4507.7254796627. The cubic root of 20319589 is about 272.8799581367.

The spelling of 20319589 in words is "twenty million, three hundred nineteen thousand, five hundred eighty-nine".