20393187589 has 2 divisors, whose sum is σ = 20393187590. Its totient is φ = 20393187588.

The previous prime is 20393187587. The next prime is 20393187601. The reversal of 20393187589 is 98578139302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10479002689 + 9914184900 = 102367^2 + 99570^2 .

It is a cyclic number.

It is not a de Polignac number, because 20393187589 - 2¹ = 20393187587 is a prime.

Together with 20393187587, 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 (20393187583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10196593794 + 10196593795.

It is an arithmetic number, because the mean of its divisors is an integer number (10196593795).

Almost surely, 2^20393187589 is an apocalyptic number.

It is an amenable number.

20393187589 is a deficient number, since it is larger than the sum of its proper divisors (1).

20393187589 is an equidigital number, since it uses as much as digits as its factorization.

20393187589 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3265920, while the sum is 55.

The spelling of 20393187589 in words is "twenty billion, three hundred ninety-three million, one hundred eighty-seven thousand, five hundred eighty-nine".