20729089429 has 2 divisors, whose sum is σ = 20729089430. Its totient is φ = 20729089428.

The previous prime is 20729089391. The next prime is 20729089439. The reversal of 20729089429 is 92498092702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20263522500 + 465566929 = 142350^2 + 21577^2 .

It is a cyclic number.

It is not a de Polignac number, because 20729089429 - 2⁹ = 20729088917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20729089439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10364544714 + 10364544715.

It is an arithmetic number, because the mean of its divisors is an integer number (10364544715).

Almost surely, 2^20729089429 is an apocalyptic number.

It is an amenable number.

20729089429 is a deficient number, since it is larger than the sum of its proper divisors (1).

20729089429 is an equidigital number, since it uses as much as digits as its factorization.

20729089429 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1306368, while the sum is 52.

The spelling of 20729089429 in words is "twenty billion, seven hundred twenty-nine million, eighty-nine thousand, four hundred twenty-nine".