20368485509 has 2 divisors, whose sum is σ = 20368485510. Its totient is φ = 20368485508.

The previous prime is 20368485503. The next prime is 20368485541. The reversal of 20368485509 is 90558486302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11643057409 + 8725428100 = 107903^2 + 93410^2 .

It is a cyclic number.

It is not a de Polignac number, because 20368485509 - 2²⁰ = 20367436933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20368485503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10184242754 + 10184242755.

It is an arithmetic number, because the mean of its divisors is an integer number (10184242755).

Almost surely, 2^20368485509 is an apocalyptic number.

It is an amenable number.

20368485509 is a deficient number, since it is larger than the sum of its proper divisors (1).

20368485509 is an equidigital number, since it uses as much as digits as its factorization.

20368485509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2073600, while the sum is 50.

The spelling of 20368485509 in words is "twenty billion, three hundred sixty-eight million, four hundred eighty-five thousand, five hundred nine".