20172344 has 16 divisors (see below), whose sum is σ = 38191920. Its totient is φ = 9987840.

The previous prime is 20172343. The next prime is 20172349. The reversal of 20172344 is 44327102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20172343) 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 3 ways as a sum of consecutive naturals, for example, 11417 + ... + 13064.

It is an arithmetic number, because the mean of its divisors is an integer number (2386995).

Almost surely, 2^20172344 is an apocalyptic number.

It is an amenable number.

20172344 is a deficient number, since it is larger than the sum of its proper divisors (18019576).

20172344 is a wasteful number, since it uses less digits than its factorization.

20172344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24590 (or 24586 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 20172344 is about 4491.3632674278. The cubic root of 20172344 is about 272.2192220565.

Adding to 20172344 its reverse (44327102), we get a palindrome (64499446).

The spelling of 20172344 in words is "twenty million, one hundred seventy-two thousand, three hundred forty-four".