20508371462617 has 2 divisors, whose sum is σ = 20508371462618. Its totient is φ = 20508371462616.

The previous prime is 20508371462599. The next prime is 20508371462629. The reversal of 20508371462617 is 71626417380502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20201644901376 + 306726561241 = 4494624^2 + 553829^2 .

It is a cyclic number.

It is not a de Polignac number, because 20508371462617 - 2²⁷ = 20508237244889 is a prime.

It is not a weakly prime, because it can be changed into another prime (20508371462717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10254185731308 + 10254185731309.

It is an arithmetic number, because the mean of its divisors is an integer number (10254185731309).

Almost surely, 2^{20508371462617} is an apocalyptic number.

It is an amenable number.

20508371462617 is a deficient number, since it is larger than the sum of its proper divisors (1).

20508371462617 is an equidigital number, since it uses as much as digits as its factorization.

20508371462617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3386880, while the sum is 52.

The spelling of 20508371462617 in words is "twenty trillion, five hundred eight billion, three hundred seventy-one million, four hundred sixty-two thousand, six hundred seventeen".