20538278298757 has 2 divisors, whose sum is σ = 20538278298758. Its totient is φ = 20538278298756.

The previous prime is 20538278298701. The next prime is 20538278298773. The reversal of 20538278298757 is 75789287283502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12287590793956 + 8250687504801 = 3505366^2 + 2872401^2 .

It is a cyclic number.

It is not a de Polignac number, because 20538278298757 - 2¹¹ = 20538278296709 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20538278298757.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20538278298557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10269139149378 + 10269139149379.

It is an arithmetic number, because the mean of its divisors is an integer number (10269139149379).

Almost surely, 2^{20538278298757} is an apocalyptic number.

It is an amenable number.

20538278298757 is a deficient number, since it is larger than the sum of its proper divisors (1).

20538278298757 is an equidigital number, since it uses as much as digits as its factorization.

20538278298757 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 948326400, while the sum is 73.

The spelling of 20538278298757 in words is "twenty trillion, five hundred thirty-eight billion, two hundred seventy-eight million, two hundred ninety-eight thousand, seven hundred fifty-seven".