20440332 has 72 divisors (see below), whose sum is σ = 57238272. Its totient is φ = 6098400.

The previous prime is 20440319. The next prime is 20440337. The reversal of 20440332 is 23304402.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20440337) 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 23 ways as a sum of consecutive naturals, for example, 27753 + ... + 28479.

It is an arithmetic number, because the mean of its divisors is an integer number (794976).

Almost surely, 2^20440332 is an apocalyptic number.

20440332 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20440332, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28619136).

20440332 is an abundant number, since it is smaller than the sum of its proper divisors (36797940).

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

20440332 is a wasteful number, since it uses less digits than its factorization.

20440332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 819 (or 814 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 18.

The square root of 20440332 is about 4521.0985390721. The cubic root of 20440332 is about 273.4193932195.

Adding to 20440332 its reverse (23304402), we get a palindrome (43744734).

The spelling of 20440332 in words is "twenty million, four hundred forty thousand, three hundred thirty-two".