20321442413 has 2 divisors, whose sum is σ = 20321442414. Its totient is φ = 20321442412.

The previous prime is 20321442409. The next prime is 20321442443. The reversal of 20321442413 is 31424412302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16629907849 + 3691534564 = 128957^2 + 60758^2 .

It is a cyclic number.

It is not a de Polignac number, because 20321442413 - 2² = 20321442409 is a prime.

It is a super-2 number, since 2×20321442413² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20321442443) 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, 10160721206 + 10160721207.

It is an arithmetic number, because the mean of its divisors is an integer number (10160721207).

Almost surely, 2^20321442413 is an apocalyptic number.

It is an amenable number.

20321442413 is a deficient number, since it is larger than the sum of its proper divisors (1).

20321442413 is an equidigital number, since it uses as much as digits as its factorization.

20321442413 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 20321442413 its reverse (31424412302), we get a palindrome (51745854715).

The spelling of 20321442413 in words is "twenty billion, three hundred twenty-one million, four hundred forty-two thousand, four hundred thirteen".