20530560989 has 2 divisors, whose sum is σ = 20530560990. Its totient is φ = 20530560988.

The previous prime is 20530560923. The next prime is 20530561019. The reversal of 20530560989 is 98906503502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18101549764 + 2429011225 = 134542^2 + 49285^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20530560989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20530566989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10265280494 + 10265280495.

It is an arithmetic number, because the mean of its divisors is an integer number (10265280495).

Almost surely, 2^20530560989 is an apocalyptic number.

It is an amenable number.

20530560989 is a deficient number, since it is larger than the sum of its proper divisors (1).

20530560989 is an equidigital number, since it uses as much as digits as its factorization.

20530560989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 583200, while the sum is 47.

The spelling of 20530560989 in words is "twenty billion, five hundred thirty million, five hundred sixty thousand, nine hundred eighty-nine".