20200120091 has 2 divisors, whose sum is σ = 20200120092. Its totient is φ = 20200120090.

The previous prime is 20200120007. The next prime is 20200120097. The reversal of 20200120091 is 19002100202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20200120091 - 2¹⁰ = 20200119067 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (20200120097) 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, 10100060045 + 10100060046.

It is an arithmetic number, because the mean of its divisors is an integer number (10100060046).

Almost surely, 2^20200120091 is an apocalyptic number.

20200120091 is a deficient number, since it is larger than the sum of its proper divisors (1).

20200120091 is an equidigital number, since it uses as much as digits as its factorization.

20200120091 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 17.

Adding to 20200120091 its reverse (19002100202), we get a palindrome (39202220293).

The spelling of 20200120091 in words is "twenty billion, two hundred million, one hundred twenty thousand, ninety-one".