20020011997 has 2 divisors, whose sum is σ = 20020011998. Its totient is φ = 20020011996.

The previous prime is 20020011953. The next prime is 20020012013. The reversal of 20020011997 is 79911002002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18004540761 + 2015471236 = 134181^2 + 44894^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20020011997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20020071997) 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, 10010005998 + 10010005999.

It is an arithmetic number, because the mean of its divisors is an integer number (10010005999).

Almost surely, 2^20020011997 is an apocalyptic number.

It is an amenable number.

20020011997 is a deficient number, since it is larger than the sum of its proper divisors (1).

20020011997 is an equidigital number, since it uses as much as digits as its factorization.

20020011997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 31.

Adding to 20020011997 its reverse (79911002002), we get a palindrome (99931013999).

The spelling of 20020011997 in words is "twenty billion, twenty million, eleven thousand, nine hundred ninety-seven".