20388738001778 has 16 divisors (see below), whose sum is σ = 30590932941240. Its totient is φ = 10191760588800.

The previous prime is 20388738001759. The next prime is 20388738001783. The reversal of 20388738001778 is 87710083788302.

It can be written as a sum of positive squares in 4 ways, for example, as 5244086260009 + 15144651741769 = 2289997^2 + 3891613^2 .

It is a super-2 number, since 2×20388738001778² (a number of 27 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (62) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 20388738001778.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 228936938 + ... + 229025978.

Almost surely, 2^{20388738001778} is an apocalyptic number.

20388738001778 is a deficient number, since it is larger than the sum of its proper divisors (10202194939462).

20388738001778 is a wasteful number, since it uses less digits than its factorization.

20388738001778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117053.

The product of its (nonzero) digits is 25288704, while the sum is 62.

The spelling of 20388738001778 in words is "twenty trillion, three hundred eighty-eight billion, seven hundred thirty-eight million, one thousand, seven hundred seventy-eight".