20590085617 has 2 divisors, whose sum is σ = 20590085618. Its totient is φ = 20590085616.

The previous prime is 20590085587. The next prime is 20590085671. The reversal of 20590085617 is 71658009502.

Together with next prime (20590085671) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14459822001 + 6130263616 = 120249^2 + 78296^2 .

It is a cyclic number.

It is not a de Polignac number, because 20590085617 - 2¹⁵ = 20590052849 is a prime.

It is not a weakly prime, because it can be changed into another prime (20590085017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10295042808 + 10295042809.

It is an arithmetic number, because the mean of its divisors is an integer number (10295042809).

Almost surely, 2^20590085617 is an apocalyptic number.

It is an amenable number.

20590085617 is a deficient number, since it is larger than the sum of its proper divisors (1).

20590085617 is an equidigital number, since it uses as much as digits as its factorization.

20590085617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 151200, while the sum is 43.

The spelling of 20590085617 in words is "twenty billion, five hundred ninety million, eighty-five thousand, six hundred seventeen".