20349172 has 6 divisors (see below), whose sum is σ = 35611058. Its totient is φ = 10174584.

The previous prime is 20349157. The next prime is 20349179. The reversal of 20349172 is 27194302.

It can be written as a sum of positive squares in only one way, i.e., 16941456 + 3407716 = 4116^2 + 1846^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20349172.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20349179) 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 as a sum of consecutive naturals, namely, 2543643 + ... + 2543650.

Almost surely, 2^20349172 is an apocalyptic number.

It is an amenable number.

20349172 is a deficient number, since it is larger than the sum of its proper divisors (15261886).

20349172 is a wasteful number, since it uses less digits than its factorization.

20349172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5087297 (or 5087295 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 20349172 is about 4511.0056528451. The cubic root of 20349172 is about 273.0123212694.

The spelling of 20349172 in words is "twenty million, three hundred forty-nine thousand, one hundred seventy-two".