20729145289 has 2 divisors, whose sum is σ = 20729145290. Its totient is φ = 20729145288.

The previous prime is 20729145263. The next prime is 20729145341. The reversal of 20729145289 is 98254192702.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15475360000 + 5253785289 = 124400^2 + 72483^2 .

It is a cyclic number.

It is not a de Polignac number, because 20729145289 - 2⁵ = 20729145257 is a prime.

It is not a weakly prime, because it can be changed into another prime (20729145259) 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, 10364572644 + 10364572645.

It is an arithmetic number, because the mean of its divisors is an integer number (10364572645).

Almost surely, 2^20729145289 is an apocalyptic number.

It is an amenable number.

20729145289 is a deficient number, since it is larger than the sum of its proper divisors (1).

20729145289 is an equidigital number, since it uses as much as digits as its factorization.

20729145289 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 725760, while the sum is 49.

The spelling of 20729145289 in words is "twenty billion, seven hundred twenty-nine million, one hundred forty-five thousand, two hundred eighty-nine".