20171208018 has 16 divisors (see below), whose sum is σ = 43445678976. Its totient is φ = 6206525520.

The previous prime is 20171208017. The next prime is 20171208047. The reversal of 20171208018 is 81080217102.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20171208017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129302538 + ... + 129302693.

It is an arithmetic number, because the mean of its divisors is an integer number (2715354936).

Almost surely, 2^20171208018 is an apocalyptic number.

20171208018 is an abundant number, since it is smaller than the sum of its proper divisors (23274470958).

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

20171208018 is a wasteful number, since it uses less digits than its factorization.

20171208018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258605249.

The product of its (nonzero) digits is 1792, while the sum is 30.

The spelling of 20171208018 in words is "twenty billion, one hundred seventy-one million, two hundred eight thousand, eighteen".