20798129801 has 2 divisors, whose sum is σ = 20798129802. Its totient is φ = 20798129800.

The previous prime is 20798129743. The next prime is 20798129843. The reversal of 20798129801 is 10892189702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19761611776 + 1036518025 = 140576^2 + 32195^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20798129801 is a prime.

It is not a weakly prime, because it can be changed into another prime (20798129861) 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, 10399064900 + 10399064901.

It is an arithmetic number, because the mean of its divisors is an integer number (10399064901).

Almost surely, 2^20798129801 is an apocalyptic number.

It is an amenable number.

20798129801 is a deficient number, since it is larger than the sum of its proper divisors (1).

20798129801 is an equidigital number, since it uses as much as digits as its factorization.

20798129801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 47.

The spelling of 20798129801 in words is "twenty billion, seven hundred ninety-eight million, one hundred twenty-nine thousand, eight hundred one".