20017185187172 has 24 divisors (see below), whose sum is σ = 35083876833600. Its totient is φ = 9993221076960.

The previous prime is 20017185187133. The next prime is 20017185187247. The reversal of 20017185187172 is 27178158171002.

It is a self number, because there is not a number n which added to its sum of digits gives 20017185187172.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 220197113 + ... + 220287999.

It is an arithmetic number, because the mean of its divisors is an integer number (1461828201400).

Almost surely, 2^{20017185187172} is an apocalyptic number.

It is an amenable number.

20017185187172 is a deficient number, since it is larger than the sum of its proper divisors (15066691646428).

20017185187172 is a wasteful number, since it uses less digits than its factorization.

20017185187172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174851 (or 174849 counting only the distinct ones).

The product of its (nonzero) digits is 439040, while the sum is 50.

The spelling of 20017185187172 in words is "twenty trillion, seventeen billion, one hundred eighty-five million, one hundred eighty-seven thousand, one hundred seventy-two".