20430509017 has 2 divisors, whose sum is σ = 20430509018. Its totient is φ = 20430509016.

The previous prime is 20430508933. The next prime is 20430509039. The reversal of 20430509017 is 71090503402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19942805961 + 487703056 = 141219^2 + 22084^2 .

It is a cyclic number.

It is not a de Polignac number, because 20430509017 - 2¹¹ = 20430506969 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20430509017.

It is not a weakly prime, because it can be changed into another prime (20430509087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10215254508 + 10215254509.

It is an arithmetic number, because the mean of its divisors is an integer number (10215254509).

Almost surely, 2^20430509017 is an apocalyptic number.

It is an amenable number.

20430509017 is a deficient number, since it is larger than the sum of its proper divisors (1).

20430509017 is an equidigital number, since it uses as much as digits as its factorization.

20430509017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 31.

The spelling of 20430509017 in words is "twenty billion, four hundred thirty million, five hundred nine thousand, seventeen".