20680172 has 12 divisors (see below), whose sum is σ = 36476160. Its totient is φ = 10258416.

The previous prime is 20680139. The next prime is 20680181. The reversal of 20680172 is 27108602.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19847 + ... + 20862.

It is an arithmetic number, because the mean of its divisors is an integer number (3039680).

Almost surely, 2^20680172 is an apocalyptic number.

It is an amenable number.

20680172 is a deficient number, since it is larger than the sum of its proper divisors (15795988).

20680172 is a wasteful number, since it uses less digits than its factorization.

20680172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40840 (or 40838 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 20680172 is about 4547.5457116999. The cubic root of 20680172 is about 274.4846414168.

Adding to 20680172 its reverse (27108602), we get a palindrome (47788774).

The spelling of 20680172 in words is "twenty million, six hundred eighty thousand, one hundred seventy-two".