20044648777 has 2 divisors, whose sum is σ = 20044648778. Its totient is φ = 20044648776.

The previous prime is 20044648751. The next prime is 20044648801. The reversal of 20044648777 is 77784644002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18711230521 + 1333418256 = 136789^2 + 36516^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20044648777 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20044648777.

It is not a weakly prime, because it can be changed into another prime (20044648727) 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 as a sum of consecutive naturals, namely, 10022324388 + 10022324389.

It is an arithmetic number, because the mean of its divisors is an integer number (10022324389).

Almost surely, 2^20044648777 is an apocalyptic number.

It is an amenable number.

20044648777 is a deficient number, since it is larger than the sum of its proper divisors (1).

20044648777 is an equidigital number, since it uses as much as digits as its factorization.

20044648777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2107392, while the sum is 49.

The spelling of 20044648777 in words is "twenty billion, forty-four million, six hundred forty-eight thousand, seven hundred seventy-seven".