20404344413 has 2 divisors, whose sum is σ = 20404344414. Its totient is φ = 20404344412.

The previous prime is 20404344409. The next prime is 20404344419. The reversal of 20404344413 is 31444340402.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19769203609 + 635140804 = 140603^2 + 25202^2 .

It is a cyclic number.

It is not a de Polignac number, because 20404344413 - 2² = 20404344409 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20404344419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10202172206 + 10202172207.

It is an arithmetic number, because the mean of its divisors is an integer number (10202172207).

Almost surely, 2^20404344413 is an apocalyptic number.

It is an amenable number.

20404344413 is a deficient number, since it is larger than the sum of its proper divisors (1).

20404344413 is an equidigital number, since it uses as much as digits as its factorization.

20404344413 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18432, while the sum is 29.

Adding to 20404344413 its reverse (31444340402), we get a palindrome (51848684815).

The spelling of 20404344413 in words is "twenty billion, four hundred four million, three hundred forty-four thousand, four hundred thirteen".