20388738001777 has 6 divisors (see below), whose sum is σ = 20954678137638. Its totient is φ = 19837691027424.

The previous prime is 20388738001759. The next prime is 20388738001783. The reversal of 20388738001777 is 77710083788302.

It can be written as a sum of positive squares in 3 ways, for example, as 16852593146481 + 3536144855296 = 4105191^2 + 1880464^2 .

It is not a de Polignac number, because 20388738001777 - 2³⁹ = 19838982187889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20388738001717) 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, 7446579348 + ... + 7446582085.

It is an arithmetic number, because the mean of its divisors is an integer number (3492446356273).

Almost surely, 2^{20388738001777} is an apocalyptic number.

It is an amenable number.

20388738001777 is a deficient number, since it is larger than the sum of its proper divisors (565940135861).

20388738001777 is an equidigital number, since it uses as much as digits as its factorization.

20388738001777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14893161507 (or 14893161470 counting only the distinct ones).

The product of its (nonzero) digits is 22127616, while the sum is 61.

The spelling of 20388738001777 in words is "twenty trillion, three hundred eighty-eight billion, seven hundred thirty-eight million, one thousand, seven hundred seventy-seven".