20648405799 has 12 divisors (see below), whose sum is σ = 34086257296. Its totient is φ = 11799088992.

The previous prime is 20648405783. The next prime is 20648405803. The reversal of 20648405799 is 99750484602.

20648405799 is a `hidden beast` number, since 2 + 0 + 64 + 8 + 4 + 0 + 579 + 9 = 666.

It is not a de Polignac number, because 20648405799 - 2⁴ = 20648405783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20648405749) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 163876174 + ... + 163876299.

Almost surely, 2^20648405799 is an apocalyptic number.

20648405799 is a deficient number, since it is larger than the sum of its proper divisors (13437851497).

20648405799 is a wasteful number, since it uses less digits than its factorization.

20648405799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327752486 (or 327752483 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 54.

The spelling of 20648405799 in words is "twenty billion, six hundred forty-eight million, four hundred five thousand, seven hundred ninety-nine".