20506252573 has 2 divisors, whose sum is σ = 20506252574. Its totient is φ = 20506252572.

The previous prime is 20506252561. The next prime is 20506252597. The reversal of 20506252573 is 37525260502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11831565529 + 8674687044 = 108773^2 + 93138^2 .

It is a cyclic number.

It is not a de Polignac number, because 20506252573 - 2¹⁷ = 20506121501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20506252523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10253126286 + 10253126287.

It is an arithmetic number, because the mean of its divisors is an integer number (10253126287).

Almost surely, 2^20506252573 is an apocalyptic number.

It is an amenable number.

20506252573 is a deficient number, since it is larger than the sum of its proper divisors (1).

20506252573 is an equidigital number, since it uses as much as digits as its factorization.

20506252573 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 126000, while the sum is 37.

The spelling of 20506252573 in words is "twenty billion, five hundred six million, two hundred fifty-two thousand, five hundred seventy-three".