20443040 has 48 divisors (see below), whose sum is σ = 49043232. Its totient is φ = 8050944.

The previous prime is 20443039. The next prime is 20443081. The reversal of 20443040 is 4034402.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9767 + ... + 11673.

It is an arithmetic number, because the mean of its divisors is an integer number (1021734).

Almost surely, 2^20443040 is an apocalyptic number.

20443040 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 20443040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24521616).

20443040 is an abundant number, since it is smaller than the sum of its proper divisors (28600192).

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

20443040 is a wasteful number, since it uses less digits than its factorization.

20443040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1989 (or 1981 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 17.

The square root of 20443040 is about 4521.3980138891. The cubic root of 20443040 is about 273.4314671757.

Adding to 20443040 its reverse (4034402), we get a palindrome (24477442).

The spelling of 20443040 in words is "twenty million, four hundred forty-three thousand, forty".