20001120197 has 2 divisors, whose sum is σ = 20001120198. Its totient is φ = 20001120196.

The previous prime is 20001120187. The next prime is 20001120253. The reversal of 20001120197 is 79102110002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19952692516 + 48427681 = 141254^2 + 6959^2 .

It is a cyclic number.

It is not a de Polignac number, because 20001120197 - 2¹² = 20001116101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20001120157) 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, 10000560098 + 10000560099.

It is an arithmetic number, because the mean of its divisors is an integer number (10000560099).

Almost surely, 2^20001120197 is an apocalyptic number.

It is an amenable number.

20001120197 is a deficient number, since it is larger than the sum of its proper divisors (1).

20001120197 is an equidigital number, since it uses as much as digits as its factorization.

20001120197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 252, while the sum is 23.

Adding to 20001120197 its reverse (79102110002), we get a palindrome (99103230199).

The spelling of 20001120197 in words is "twenty billion, one million, one hundred twenty thousand, one hundred ninety-seven".