172983720020 has 18 divisors (see below), whose sum is σ = 363269718126. Its totient is φ = 69192744000.

The previous prime is 172983719977. The next prime is 172983720037. The reversal of 172983720020 is 20027389271.

It can be written as a sum of positive squares in 3 ways, for example, as 73681845136 + 99301874884 = 271444^2 + 315122^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 172983720020.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1813520 + ... + 1906520.

It is an arithmetic number, because the mean of its divisors is an integer number (20181651007).

Almost surely, 2^172983720020 is an apocalyptic number.

172983720020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172983720020 is an abundant number, since it is smaller than the sum of its proper divisors (190285998106).

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

172983720020 is an frugal number, since it uses more digits than its factorization.

172983720020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186011 (or 93008 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 41.

The spelling of 172983720020 in words is "one hundred seventy-two billion, nine hundred eighty-three million, seven hundred twenty thousand, twenty".