20431344 has 20 divisors (see below), whose sum is σ = 52781096. Its totient is φ = 6810432.

The previous prime is 20431343. The next prime is 20431381. The reversal of 20431344 is 44313402.

It is a self number, because there is not a number n which added to its sum of digits gives 20431344.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20431343) 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, 212779 + ... + 212874.

Almost surely, 2^20431344 is an apocalyptic number.

20431344 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20431344 is an abundant number, since it is smaller than the sum of its proper divisors (32349752).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20431344 is a wasteful number, since it uses less digits than its factorization.

20431344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425664 (or 425658 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 20431344 is about 4520.1044235725. The cubic root of 20431344 is about 273.3793114538.

Adding to 20431344 its reverse (44313402), we get a palindrome (64744746).

The spelling of 20431344 in words is "twenty million, four hundred thirty-one thousand, three hundred forty-four".