20404304413 has 2 divisors, whose sum is σ = 20404304414. Its totient is φ = 20404304412.

The previous prime is 20404304381. The next prime is 20404304441. The reversal of 20404304413 is 31440340402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17423472004 + 2980832409 = 131998^2 + 54597^2 .

It is a cyclic number.

It is not a de Polignac number, because 20404304413 - 2⁵ = 20404304381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20404344413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10202152206 + 10202152207.

It is an arithmetic number, because the mean of its divisors is an integer number (10202152207).

Almost surely, 2^20404304413 is an apocalyptic number.

It is an amenable number.

20404304413 is a deficient number, since it is larger than the sum of its proper divisors (1).

20404304413 is an equidigital number, since it uses as much as digits as its factorization.

20404304413 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 25.

Adding to 20404304413 its reverse (31440340402), we get a palindrome (51844644815).

The spelling of 20404304413 in words is "twenty billion, four hundred four million, three hundred four thousand, four hundred thirteen".