20172194 has 16 divisors (see below), whose sum is σ = 34900800. Its totient is φ = 8565264.

The previous prime is 20172193. The next prime is 20172199. The reversal of 20172194 is 49127102.

It is not an unprimeable number, because it can be changed into a prime (20172193) 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 7 ways as a sum of consecutive naturals, for example, 5084 + ... + 8135.

It is an arithmetic number, because the mean of its divisors is an integer number (2181300).

Almost surely, 2^20172194 is an apocalyptic number.

20172194 is a deficient number, since it is larger than the sum of its proper divisors (14728606).

20172194 is a wasteful number, since it uses less digits than its factorization.

20172194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13337.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 20172194 is about 4491.3465686807. The cubic root of 20172194 is about 272.2185473211.

Adding to 20172194 its reverse (49127102), we get a palindrome (69299296).

The spelling of 20172194 in words is "twenty million, one hundred seventy-two thousand, one hundred ninety-four".