20404443413 has 8 divisors (see below), whose sum is σ = 21119275800. Its totient is φ = 19690359808.

The previous prime is 20404443407. The next prime is 20404443419. The reversal of 20404443413 is 31434440402.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20404443407) and next prime (20404443419).

It can be written as a sum of positive squares in 4 ways, for example, as 8497705489 + 11906737924 = 92183^2 + 109118^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20404443413 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20404443419) 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 in 7 ways as a sum of consecutive naturals, for example, 131456 + ... + 241017.

It is an arithmetic number, because the mean of its divisors is an integer number (2639909475).

Almost surely, 2^20404443413 is an apocalyptic number.

It is an amenable number.

20404443413 is a deficient number, since it is larger than the sum of its proper divisors (714832387).

20404443413 is a wasteful number, since it uses less digits than its factorization.

20404443413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374391.

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

Adding to 20404443413 its reverse (31434440402), we get a palindrome (51838883815).

The spelling of 20404443413 in words is "twenty billion, four hundred four million, four hundred forty-three thousand, four hundred thirteen".