20718371629 has 2 divisors, whose sum is σ = 20718371630. Its totient is φ = 20718371628.

The previous prime is 20718371567. The next prime is 20718371747. The reversal of 20718371629 is 92617381702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20420981604 + 297390025 = 142902^2 + 17245^2 .

It is a cyclic number.

It is not a de Polignac number, because 20718371629 - 2³³ = 12128437037 is a prime.

It is a super-2 number, since 2×20718371629² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20718321629) 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, 10359185814 + 10359185815.

It is an arithmetic number, because the mean of its divisors is an integer number (10359185815).

Almost surely, 2^20718371629 is an apocalyptic number.

It is an amenable number.

20718371629 is a deficient number, since it is larger than the sum of its proper divisors (1).

20718371629 is an equidigital number, since it uses as much as digits as its factorization.

20718371629 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 254016, while the sum is 46.

The spelling of 20718371629 in words is "twenty billion, seven hundred eighteen million, three hundred seventy-one thousand, six hundred twenty-nine".