20047172 has 12 divisors (see below), whose sum is σ = 35120316. Its totient is φ = 10012800.

The previous prime is 20047151. The next prime is 20047177. The reversal of 20047172 is 27174002.

It can be written as a sum of positive squares in 2 ways, for example, as 4946176 + 15100996 = 2224^2 + 3886^2 .

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (20047177) 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, 2672 + ... + 6872.

It is an arithmetic number, because the mean of its divisors is an integer number (2926693).

Almost surely, 2^20047172 is an apocalyptic number.

It is an amenable number.

20047172 is a deficient number, since it is larger than the sum of its proper divisors (15073144).

20047172 is a wasteful number, since it uses less digits than its factorization.

20047172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5398 (or 5396 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 23.

The square root of 20047172 is about 4477.4068387851. The cubic root of 20047172 is about 271.6550016110.

The spelling of 20047172 in words is "twenty million, forty-seven thousand, one hundred seventy-two".