20330439889 has 2 divisors, whose sum is σ = 20330439890. Its totient is φ = 20330439888.

The previous prime is 20330439881. The next prime is 20330439917. The reversal of 20330439889 is 98893403302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18175623489 + 2154816400 = 134817^2 + 46420^2 .

It is a cyclic number.

It is not a de Polignac number, because 20330439889 - 2³ = 20330439881 is a prime.

It is not a weakly prime, because it can be changed into another prime (20330439881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10165219944 + 10165219945.

It is an arithmetic number, because the mean of its divisors is an integer number (10165219945).

Almost surely, 2^20330439889 is an apocalyptic number.

It is an amenable number.

20330439889 is a deficient number, since it is larger than the sum of its proper divisors (1).

20330439889 is an equidigital number, since it uses as much as digits as its factorization.

20330439889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1119744, while the sum is 49.

The spelling of 20330439889 in words is "twenty billion, three hundred thirty million, four hundred thirty-nine thousand, eight hundred eighty-nine".