2020020091 has 2 divisors, whose sum is σ = 2020020092. Its totient is φ = 2020020090.

The previous prime is 2020020083. The next prime is 2020020127. The reversal of 2020020091 is 1900200202.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2020020091 - 2³ = 2020020083 is a prime.

It is not a weakly prime, because it can be changed into another prime (2020020031) 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, 1010010045 + 1010010046.

It is an arithmetic number, because the mean of its divisors is an integer number (1010010046).

Almost surely, 2^2020020091 is an apocalyptic number.

2020020091 is a deficient number, since it is larger than the sum of its proper divisors (1).

2020020091 is an equidigital number, since it uses as much as digits as its factorization.

2020020091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 2020020091 is about 44944.6336173742. The cubic root of 2020020091 is about 1264.1110558017. Note that the first 3 decimals are identical.

Adding to 2020020091 its reverse (1900200202), we get a palindrome (3920220293).

The spelling of 2020020091 in words is "two billion, twenty million, twenty thousand, ninety-one".