20664804349 has 30 divisors (see below), whose sum is σ = 24415560730. Its totient is φ = 17487731520.

The previous prime is 20664804337. The next prime is 20664804373. The reversal of 20664804349 is 94340846602.

It can be written as a sum of positive squares in 3 ways, for example, as 8040708900 + 12624095449 = 89670^2 + 112357^2 .

It is not a de Polignac number, because 20664804349 - 2¹⁵ = 20664771581 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20664804299 and 20664804308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20664805349) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 73540089 + ... + 73540369.

Almost surely, 2^20664804349 is an apocalyptic number.

It is an amenable number.

20664804349 is a deficient number, since it is larger than the sum of its proper divisors (3750756381).

20664804349 is an frugal number, since it uses more digits than its factorization.

20664804349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 699 (or 397 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 46.

The spelling of 20664804349 in words is "twenty billion, six hundred sixty-four million, eight hundred four thousand, three hundred forty-nine".