20044440 has 96 divisors (see below), whose sum is σ = 70171920. Its totient is φ = 4932864.

The previous prime is 20044397. The next prime is 20044447. The reversal of 20044440 is 4444002.

It is a happy number.

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 (20044447) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2539 + ... + 6821.

Almost surely, 2^20044440 is an apocalyptic number.

20044440 is a gapful number since it is divisible by the number (20) 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 20044440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35085960).

20044440 is an abundant number, since it is smaller than the sum of its proper divisors (50127480).

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

20044440 is a wasteful number, since it uses less digits than its factorization.

20044440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4313 (or 4306 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

The square root of 20044440 is about 4477.1017410821. The cubic root of 20044440 is about 271.6426607984.

Adding to 20044440 its reverse (4444002), we get a palindrome (24488442).

The spelling of 20044440 in words is "twenty million, forty-four thousand, four hundred forty".