20708861388629 has 2 divisors, whose sum is σ = 20708861388630. Its totient is φ = 20708861388628.

The previous prime is 20708861388497. The next prime is 20708861388679. The reversal of 20708861388629 is 92688316880702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20047245082225 + 661616306404 = 4477415^2 + 813398^2 .

It is a cyclic number.

It is not a de Polignac number, because 20708861388629 - 2⁴⁴ = 3116675344213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20708861388679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10354430694314 + 10354430694315.

It is an arithmetic number, because the mean of its divisors is an integer number (10354430694315).

Almost surely, 2^{20708861388629} is an apocalyptic number.

It is an amenable number.

20708861388629 is a deficient number, since it is larger than the sum of its proper divisors (1).

20708861388629 is an equidigital number, since it uses as much as digits as its factorization.

20708861388629 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 111476736, while the sum is 68.

The spelling of 20708861388629 in words is "twenty trillion, seven hundred eight billion, eight hundred sixty-one million, three hundred eighty-eight thousand, six hundred twenty-nine".