2020863809 has 2 divisors, whose sum is σ = 2020863810. Its totient is φ = 2020863808.

The previous prime is 2020863787. The next prime is 2020863829. The reversal of 2020863809 is 9083680202.

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., 1329331600 + 691532209 = 36460^2 + 26297^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2020863809 is a prime.

It is not a weakly prime, because it can be changed into another prime (2020863829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010431904 + 1010431905.

It is an arithmetic number, because the mean of its divisors is an integer number (1010431905).

Almost surely, 2^2020863809 is an apocalyptic number.

It is an amenable number.

2020863809 is a deficient number, since it is larger than the sum of its proper divisors (1).

2020863809 is an equidigital number, since it uses as much as digits as its factorization.

2020863809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 2020863809 is about 44954.0188303560. The cubic root of 2020863809 is about 1264.2870284400.

The spelling of 2020863809 in words is "two billion, twenty million, eight hundred sixty-three thousand, eight hundred nine".