20163171885906 has 48 divisors (see below), whose sum is σ = 46910981123424. Its totient is φ = 5760814824576.

The previous prime is 20163171885889. The next prime is 20163171885937. The reversal of 20163171885906 is 60958817136102.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19232341 + ... + 20253623.

It is an arithmetic number, because the mean of its divisors is an integer number (977312106738).

Almost surely, 2^{20163171885906} is an apocalyptic number.

20163171885906 is an abundant number, since it is smaller than the sum of its proper divisors (26747809237518).

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

20163171885906 is a wasteful number, since it uses less digits than its factorization.

20163171885906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1088455 (or 1088448 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 57.

The spelling of 20163171885906 in words is "twenty trillion, one hundred sixty-three billion, one hundred seventy-one million, eight hundred eighty-five thousand, nine hundred six".