20838963889 has 2 divisors, whose sum is σ = 20838963890. Its totient is φ = 20838963888.

The previous prime is 20838963839. The next prime is 20838963913. The reversal of 20838963889 is 98836983802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15922149489 + 4916814400 = 126183^2 + 70120^2 .

It is a cyclic number.

It is not a de Polignac number, because 20838963889 - 2¹¹ = 20838961841 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20838963889.

It is not a weakly prime, because it can be changed into another prime (20838963839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10419481944 + 10419481945.

It is an arithmetic number, because the mean of its divisors is an integer number (10419481945).

Almost surely, 2^20838963889 is an apocalyptic number.

It is an amenable number.

20838963889 is a deficient number, since it is larger than the sum of its proper divisors (1).

20838963889 is an equidigital number, since it uses as much as digits as its factorization.

20838963889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 35831808, while the sum is 64.

The spelling of 20838963889 in words is "twenty billion, eight hundred thirty-eight million, nine hundred sixty-three thousand, eight hundred eighty-nine".