20358386809 has 2 divisors, whose sum is σ = 20358386810. Its totient is φ = 20358386808.

The previous prime is 20358386683. The next prime is 20358386813. The reversal of 20358386809 is 90868385302.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20314230784 + 44156025 = 142528^2 + 6645^2 .

It is a cyclic number.

It is not a de Polignac number, because 20358386809 - 2¹⁹ = 20357862521 is a prime.

It is not a weakly prime, because it can be changed into another prime (20358386879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10179193404 + 10179193405.

It is an arithmetic number, because the mean of its divisors is an integer number (10179193405).

Almost surely, 2^20358386809 is an apocalyptic number.

It is an amenable number.

20358386809 is a deficient number, since it is larger than the sum of its proper divisors (1).

20358386809 is an equidigital number, since it uses as much as digits as its factorization.

20358386809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2488320, while the sum is 52.

The spelling of 20358386809 in words is "twenty billion, three hundred fifty-eight million, three hundred eighty-six thousand, eight hundred nine".