20420024440 has 64 divisors (see below), whose sum is σ = 46845423360. Its totient is φ = 8008166400.

The previous prime is 20420024399. The next prime is 20420024447. The reversal of 20420024440 is 4442002402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20420024447) 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 15 ways as a sum of consecutive naturals, for example, 4133652 + ... + 4138588.

It is an arithmetic number, because the mean of its divisors is an integer number (731959740).

Almost surely, 2^20420024440 is an apocalyptic number.

20420024440 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 20420024440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23422711680).

20420024440 is an abundant number, since it is smaller than the sum of its proper divisors (26425398920).

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

20420024440 is a wasteful number, since it uses less digits than its factorization.

20420024440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6952 (or 6948 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 22.

Adding to 20420024440 its reverse (4442002402), we get a palindrome (24862026842).

The spelling of 20420024440 in words is "twenty billion, four hundred twenty million, twenty-four thousand, four hundred forty".