20705408824237 has 2 divisors, whose sum is σ = 20705408824238. Its totient is φ = 20705408824236.

The previous prime is 20705408824223. The next prime is 20705408824253. The reversal of 20705408824237 is 73242880450702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13423862771881 + 7281546052356 = 3663859^2 + 2698434^2 .

It is a cyclic number.

It is not a de Polignac number, because 20705408824237 - 2⁷ = 20705408824109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20705408854237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10352704412118 + 10352704412119.

It is an arithmetic number, because the mean of its divisors is an integer number (10352704412119).

Almost surely, 2^{20705408824237} is an apocalyptic number.

It is an amenable number.

20705408824237 is a deficient number, since it is larger than the sum of its proper divisors (1).

20705408824237 is an equidigital number, since it uses as much as digits as its factorization.

20705408824237 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6021120, while the sum is 52.

The spelling of 20705408824237 in words is "twenty trillion, seven hundred five billion, four hundred eight million, eight hundred twenty-four thousand, two hundred thirty-seven".