20240440 has 64 divisors (see below), whose sum is σ = 50168160. Its totient is φ = 7288320.

The previous prime is 20240431. The next prime is 20240449. The reversal of 20240440 is 4404202.

It is an interprime number because it is at equal distance from previous prime (20240431) and next prime (20240449).

It is a super-2 number, since 2×20240440² = 819350822787200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20240449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68934 + ... + 69226.

Almost surely, 2^20240440 is an apocalyptic number.

20240440 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 20240440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25084080).

20240440 is an abundant number, since it is smaller than the sum of its proper divisors (29927720).

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

20240440 is a wasteful number, since it uses less digits than its factorization.

20240440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472 (or 468 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 16.

The square root of 20240440 is about 4498.9376523797. The cubic root of 20240440 is about 272.5251891537.

Adding to 20240440 its reverse (4404202), we get a palindrome (24644642).

The spelling of 20240440 in words is "twenty million, two hundred forty thousand, four hundred forty".