20404313440213 has 2 divisors, whose sum is σ = 20404313440214. Its totient is φ = 20404313440212.

The previous prime is 20404313440183. The next prime is 20404313440333. The reversal of 20404313440213 is 31204431340402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14522364315684 + 5881949124529 = 3810822^2 + 2425273^2 .

It is a cyclic number.

It is not a de Polignac number, because 20404313440213 - 2⁴¹ = 18205290184661 is a prime.

It is a super-2 number, since 2×20404313440213² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20404313440613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10202156720106 + 10202156720107.

It is an arithmetic number, because the mean of its divisors is an integer number (10202156720107).

Almost surely, 2^{20404313440213} is an apocalyptic number.

It is an amenable number.

20404313440213 is a deficient number, since it is larger than the sum of its proper divisors (1).

20404313440213 is an equidigital number, since it uses as much as digits as its factorization.

20404313440213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 31.

Adding to 20404313440213 its reverse (31204431340402), we get a palindrome (51608744780615).

The spelling of 20404313440213 in words is "twenty trillion, four hundred four billion, three hundred thirteen million, four hundred forty thousand, two hundred thirteen".