20178138974186 has 16 divisors (see below), whose sum is σ = 31592078495424. Its totient is φ = 9647693488224.

The previous prime is 20178138974167. The next prime is 20178138974219. The reversal of 20178138974186 is 68147983187102.

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 7 ways as a sum of consecutive naturals, for example, 61671515 + ... + 61997838.

It is an arithmetic number, because the mean of its divisors is an integer number (1974504905964).

Almost surely, 2^{20178138974186} is an apocalyptic number.

20178138974186 is a deficient number, since it is larger than the sum of its proper divisors (11413939521238).

20178138974186 is a wasteful number, since it uses less digits than its factorization.

20178138974186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123672925.

The product of its (nonzero) digits is 32514048, while the sum is 65.

The spelling of 20178138974186 in words is "twenty trillion, one hundred seventy-eight billion, one hundred thirty-eight million, nine hundred seventy-four thousand, one hundred eighty-six".