20217935537 has 2 divisors, whose sum is σ = 20217935538. Its totient is φ = 20217935536.

The previous prime is 20217935513. The next prime is 20217935651. The reversal of 20217935537 is 73553971202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16167376801 + 4050558736 = 127151^2 + 63644^2 .

It is a cyclic number.

It is not a de Polignac number, because 20217935537 - 2¹⁴ = 20217919153 is a prime.

It is not a weakly prime, because it can be changed into another prime (20217935237) 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, 10108967768 + 10108967769.

It is an arithmetic number, because the mean of its divisors is an integer number (10108967769).

Almost surely, 2^20217935537 is an apocalyptic number.

It is an amenable number.

20217935537 is a deficient number, since it is larger than the sum of its proper divisors (1).

20217935537 is an equidigital number, since it uses as much as digits as its factorization.

20217935537 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 396900, while the sum is 44.

The spelling of 20217935537 in words is "twenty billion, two hundred seventeen million, nine hundred thirty-five thousand, five hundred thirty-seven".