20401220297 has 2 divisors, whose sum is σ = 20401220298. Its totient is φ = 20401220296.

The previous prime is 20401220263. The next prime is 20401220309. The reversal of 20401220297 is 79202210402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11842010041 + 8559210256 = 108821^2 + 92516^2 .

It is a cyclic number.

It is not a de Polignac number, because 20401220297 - 2²⁰ = 20400171721 is a prime.

It is not a weakly prime, because it can be changed into another prime (20401220207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10200610148 + 10200610149.

It is an arithmetic number, because the mean of its divisors is an integer number (10200610149).

Almost surely, 2^20401220297 is an apocalyptic number.

It is an amenable number.

20401220297 is a deficient number, since it is larger than the sum of its proper divisors (1).

20401220297 is an equidigital number, since it uses as much as digits as its factorization.

20401220297 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 29.

Adding to 20401220297 its reverse (79202210402), we get a palindrome (99603430699).

The spelling of 20401220297 in words is "twenty billion, four hundred one million, two hundred twenty thousand, two hundred ninety-seven".