20338215697 has 2 divisors, whose sum is σ = 20338215698. Its totient is φ = 20338215696.

The previous prime is 20338215691. The next prime is 20338215757. The reversal of 20338215697 is 79651283302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19492627456 + 845588241 = 139616^2 + 29079^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20338215697 is a prime.

It is not a weakly prime, because it can be changed into another prime (20338215691) 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, 10169107848 + 10169107849.

It is an arithmetic number, because the mean of its divisors is an integer number (10169107849).

Almost surely, 2^20338215697 is an apocalyptic number.

It is an amenable number.

20338215697 is a deficient number, since it is larger than the sum of its proper divisors (1).

20338215697 is an equidigital number, since it uses as much as digits as its factorization.

20338215697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 544320, while the sum is 46.

Adding to 20338215697 its reverse (79651283302), we get a palindrome (99989498999).

The spelling of 20338215697 in words is "twenty billion, three hundred thirty-eight million, two hundred fifteen thousand, six hundred ninety-seven".