20168171223842 has 16 divisors (see below), whose sum is σ = 30391083627840. Its totient is φ = 10037829495792.

The previous prime is 20168171223773. The next prime is 20168171223869. The reversal of 20168171223842 is 24832217186102.

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, 2796398 + ... + 6939465.

It is an arithmetic number, because the mean of its divisors is an integer number (1899442726740).

Almost surely, 2^{20168171223842} is an apocalyptic number.

20168171223842 is a deficient number, since it is larger than the sum of its proper divisors (10222912403998).

20168171223842 is a wasteful number, since it uses less digits than its factorization.

20168171223842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9740617.

The product of its (nonzero) digits is 516096, while the sum is 47.

The spelling of 20168171223842 in words is "twenty trillion, one hundred sixty-eight billion, one hundred seventy-one million, two hundred twenty-three thousand, eight hundred forty-two".