20388738001779 has 12 divisors (see below), whose sum is σ = 33657599241136. Its totient is φ = 11650707429552.

The previous prime is 20388738001759. The next prime is 20388738001783. The reversal of 20388738001779 is 97710083788302.

20388738001779 is a `hidden beast` number, since 2 + 0 + 3 + 8 + 87 + 380 + 0 + 177 + 9 = 666.

It is not a de Polignac number, because 20388738001779 - 2⁵ = 20388738001747 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63), and also a Moran number because the ratio is a prime number: 323630761933 = 20388738001779 / (2 + 0 + 3 + 8 + 8 + 7 + 3 + 8 + 0 + 0 + 1 + 7 + 7 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20388738001739) 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, 161815380904 + ... + 161815381029.

Almost surely, 2^{20388738001779} is an apocalyptic number.

20388738001779 is a deficient number, since it is larger than the sum of its proper divisors (13268861239357).

20388738001779 is a wasteful number, since it uses less digits than its factorization.

20388738001779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323630761946 (or 323630761943 counting only the distinct ones).

The product of its (nonzero) digits is 28449792, while the sum is 63.

The spelling of 20388738001779 in words is "twenty trillion, three hundred eighty-eight billion, seven hundred thirty-eight million, one thousand, seven hundred seventy-nine".