172520020 has 12 divisors (see below), whose sum is σ = 362292084. Its totient is φ = 69008000.

The previous prime is 172520009. The next prime is 172520027. The reversal of 172520020 is 20025271.

172520020 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 32239684 + 140280336 = 5678^2 + 11844^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 172520020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172520027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4312981 + ... + 4313020.

It is an arithmetic number, because the mean of its divisors is an integer number (30191007).

Almost surely, 2^172520020 is an apocalyptic number.

172520020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172520020 is an abundant number, since it is smaller than the sum of its proper divisors (189772064).

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

172520020 is a wasteful number, since it uses less digits than its factorization.

172520020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8626010 (or 8626008 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 172520020 is about 13134.6876628262. The cubic root of 172520020 is about 556.6896751857.

Adding to 172520020 its reverse (20025271), we get a palindrome (192545291).

The spelling of 172520020 in words is "one hundred seventy-two million, five hundred twenty thousand, twenty".