20112440 has 48 divisors (see below), whose sum is σ = 46380600. Its totient is φ = 7849088.

The previous prime is 20112439. The next prime is 20112473. The reversal of 20112440 is 4421102.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 112271 + ... + 112449.

Almost surely, 2^20112440 is an apocalyptic number.

20112440 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 20112440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23190300).

20112440 is an abundant number, since it is smaller than the sum of its proper divisors (26268160).

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

20112440 is a wasteful number, since it uses less digits than its factorization.

20112440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296 (or 239 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 20112440 is about 4484.6895098769. The cubic root of 20112440 is about 271.9494932173.

Adding to 20112440 its reverse (4421102), we get a palindrome (24533542).

The spelling of 20112440 in words is "twenty million, one hundred twelve thousand, four hundred forty".