20508120595217 has 2 divisors, whose sum is σ = 20508120595218. Its totient is φ = 20508120595216.

The previous prime is 20508120595201. The next prime is 20508120595231. The reversal of 20508120595217 is 71259502180502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10735688159296 + 9772432435921 = 3276536^2 + 3126089^2 .

It is a cyclic number.

It is not a de Polignac number, because 20508120595217 - 2⁴ = 20508120595201 is a prime.

It is not a weakly prime, because it can be changed into another prime (20508120595517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10254060297608 + 10254060297609.

It is an arithmetic number, because the mean of its divisors is an integer number (10254060297609).

Almost surely, 2^{20508120595217} is an apocalyptic number.

It is an amenable number.

20508120595217 is a deficient number, since it is larger than the sum of its proper divisors (1).

20508120595217 is an equidigital number, since it uses as much as digits as its factorization.

20508120595217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504000, while the sum is 47.

The spelling of 20508120595217 in words is "twenty trillion, five hundred eight billion, one hundred twenty million, five hundred ninety-five thousand, two hundred seventeen".