20104172 has 48 divisors (see below), whose sum is σ = 40334112. Its totient is φ = 8686080.

The previous prime is 20104171. The next prime is 20104181. The reversal of 20104172 is 27140102.

It is a self number, because there is not a number n which added to its sum of digits gives 20104172.

It is not an unprimeable number, because it can be changed into a prime (20104171) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 86168 + ... + 86400.

It is an arithmetic number, because the mean of its divisors is an integer number (840294).

Almost surely, 2^20104172 is an apocalyptic number.

20104172 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20104172 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

20104172 is a wasteful number, since it uses less digits than its factorization.

20104172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338 (or 336 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 20104172 is about 4483.7676121762. The cubic root of 20104172 is about 271.9122229741.

Adding to 20104172 its reverse (27140102), we get a palindrome (47244274).

The spelling of 20104172 in words is "twenty million, one hundred four thousand, one hundred seventy-two".