20749805099 has 2 divisors, whose sum is σ = 20749805100. Its totient is φ = 20749805098.

The previous prime is 20749805077. The next prime is 20749805147. The reversal of 20749805099 is 99050894702.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20749805099 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20749805099.

It is not a weakly prime, because it can be changed into another prime (20749805059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10374902549 + 10374902550.

It is an arithmetic number, because the mean of its divisors is an integer number (10374902550).

Almost surely, 2^20749805099 is an apocalyptic number.

20749805099 is a deficient number, since it is larger than the sum of its proper divisors (1).

20749805099 is an equidigital number, since it uses as much as digits as its factorization.

20749805099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1632960, while the sum is 53.

The spelling of 20749805099 in words is "twenty billion, seven hundred forty-nine million, eight hundred five thousand, ninety-nine".