20178138974185 has 16 divisors (see below), whose sum is σ = 24266390284800. Its totient is φ = 16107436771776.

The previous prime is 20178138974167. The next prime is 20178138974219. The reversal of 20178138974185 is 58147983187102.

It is a cyclic number.

It is not a de Polignac number, because 20178138974185 - 2¹⁹ = 20178138449897 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20033056 + ... + 21016174.

It is an arithmetic number, because the mean of its divisors is an integer number (1516649392800).

Almost surely, 2^{20178138974185} is an apocalyptic number.

It is an amenable number.

20178138974185 is a deficient number, since it is larger than the sum of its proper divisors (4088251310615).

20178138974185 is an equidigital number, since it uses as much as digits as its factorization.

20178138974185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 992040.

The product of its (nonzero) digits is 27095040, while the sum is 64.

The spelling of 20178138974185 in words is "twenty trillion, one hundred seventy-eight billion, one hundred thirty-eight million, nine hundred seventy-four thousand, one hundred eighty-five".