20968172 has 12 divisors (see below), whose sum is σ = 38625720. Its totient is φ = 9932256.

The previous prime is 20968141. The next prime is 20968177. The reversal of 20968172 is 27186902.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20968177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137873 + ... + 138024.

It is an arithmetic number, because the mean of its divisors is an integer number (3218810).

Almost surely, 2^20968172 is an apocalyptic number.

It is an amenable number.

20968172 is a deficient number, since it is larger than the sum of its proper divisors (17657548).

20968172 is a wasteful number, since it uses less digits than its factorization.

20968172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275920 (or 275918 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 20968172 is about 4579.1016586226. The cubic root of 20968172 is about 275.7529645607.

The spelling of 20968172 in words is "twenty million, nine hundred sixty-eight thousand, one hundred seventy-two".