20011022197 has 2 divisors, whose sum is σ = 20011022198. Its totient is φ = 20011022196.

The previous prime is 20011022179. The next prime is 20011022237. The reversal of 20011022197 is 79122011002.

Together with previous prime (20011022179) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18550712401 + 1460309796 = 136201^2 + 38214^2 .

It is a cyclic number.

It is not a de Polignac number, because 20011022197 - 2¹⁵ = 20010989429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20011022107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005511098 + 10005511099.

It is an arithmetic number, because the mean of its divisors is an integer number (10005511099).

Almost surely, 2^20011022197 is an apocalyptic number.

It is an amenable number.

20011022197 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011022197 is an equidigital number, since it uses as much as digits as its factorization.

20011022197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 25.

Adding to 20011022197 its reverse (79122011002), we get a palindrome (99133033199).

The spelling of 20011022197 in words is "twenty billion, eleven million, twenty-two thousand, one hundred ninety-seven".