2020817209 has 2 divisors, whose sum is σ = 2020817210. Its totient is φ = 2020817208.

The previous prime is 2020817189. The next prime is 2020817221. The reversal of 2020817209 is 9027180202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1901396025 + 119421184 = 43605^2 + 10928^2 .

It is a cyclic number.

It is not a de Polignac number, because 2020817209 - 2¹³ = 2020809017 is a prime.

It is not a weakly prime, because it can be changed into another prime (2020817299) 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, 1010408604 + 1010408605.

It is an arithmetic number, because the mean of its divisors is an integer number (1010408605).

Almost surely, 2^2020817209 is an apocalyptic number.

It is an amenable number.

2020817209 is a deficient number, since it is larger than the sum of its proper divisors (1).

2020817209 is an equidigital number, since it uses as much as digits as its factorization.

2020817209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 2020817209 is about 44953.5005199818. The cubic root of 2020817209 is about 1264.2773104457.

The spelling of 2020817209 in words is "two billion, twenty million, eight hundred seventeen thousand, two hundred nine".