20003020517 has 2 divisors, whose sum is σ = 20003020518. Its totient is φ = 20003020516.

The previous prime is 20003020463. The next prime is 20003020567. The reversal of 20003020517 is 71502030002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16721334721 + 3281685796 = 129311^2 + 57286^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20003020517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20003020567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10001510258 + 10001510259.

It is an arithmetic number, because the mean of its divisors is an integer number (10001510259).

Almost surely, 2^20003020517 is an apocalyptic number.

It is an amenable number.

20003020517 is a deficient number, since it is larger than the sum of its proper divisors (1).

20003020517 is an equidigital number, since it uses as much as digits as its factorization.

20003020517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 420, while the sum is 20.

Adding to 20003020517 its reverse (71502030002), we get a palindrome (91505050519).

The spelling of 20003020517 in words is "twenty billion, three million, twenty thousand, five hundred seventeen".