20108645178 has 8 divisors (see below), whose sum is σ = 40217290368. Its totient is φ = 6702881724.

The previous prime is 20108645129. The next prime is 20108645209. The reversal of 20108645178 is 87154680102.

It is a sphenic number, since it is the product of 3 distinct primes.

20108645178 is an admirable number.

It is a super-2 number, since 2×20108645178² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1675720426 + ... + 1675720437.

It is an arithmetic number, because the mean of its divisors is an integer number (5027161296).

Almost surely, 2^20108645178 is an apocalyptic number.

20108645178 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20108645178 is a wasteful number, since it uses less digits than its factorization.

20108645178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3351440868.

The product of its (nonzero) digits is 107520, while the sum is 42.

The spelling of 20108645178 in words is "twenty billion, one hundred eight million, six hundred forty-five thousand, one hundred seventy-eight".