20440312 has 16 divisors (see below), whose sum is σ = 38373840. Its totient is φ = 10207296.

The previous prime is 20440309. The next prime is 20440313. The reversal of 20440312 is 21304402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20440313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10573 + ... + 12355.

It is an arithmetic number, because the mean of its divisors is an integer number (2398365).

Almost surely, 2^20440312 is an apocalyptic number.

It is an amenable number.

20440312 is a deficient number, since it is larger than the sum of its proper divisors (17933528).

20440312 is a wasteful number, since it uses less digits than its factorization.

20440312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3222 (or 3218 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 20440312 is about 4521.0963272198. The cubic root of 20440312 is about 273.4193040431.

Adding to 20440312 its reverse (21304402), we get a palindrome (41744714).

The spelling of 20440312 in words is "twenty million, four hundred forty thousand, three hundred twelve".