20430816349 has 6 divisors (see below), whose sum is σ = 21357734846. Its totient is φ = 19542519480.

The previous prime is 20430816323. The next prime is 20430816379. The reversal of 20430816349 is 94361803402.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 15764560249 + 4666256100 = 125557^2 + 68310^2 .

It is not a de Polignac number, because 20430816349 - 2⁵ = 20430816317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20430816379) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19310262 + ... + 19311319.

Almost surely, 2^20430816349 is an apocalyptic number.

It is an amenable number.

20430816349 is a deficient number, since it is larger than the sum of its proper divisors (926918497).

20430816349 is an equidigital number, since it uses as much as digits as its factorization.

20430816349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38621627 (or 38621604 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 40.

The spelling of 20430816349 in words is "twenty billion, four hundred thirty million, eight hundred sixteen thousand, three hundred forty-nine".