20044442440 has 128 divisors (see below), whose sum is σ = 50621760000. Its totient is φ = 7079833600.

The previous prime is 20044442423. The next prime is 20044442471. The reversal of 20044442440 is 4424444002.

It is a junction number, because it is equal to n+sod(n) for n = 20044442399 and 20044442408.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4309236 + ... + 4313884.

It is an arithmetic number, because the mean of its divisors is an integer number (395482500).

Almost surely, 2^20044442440 is an apocalyptic number.

20044442440 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 20044442440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25310880000).

20044442440 is an abundant number, since it is smaller than the sum of its proper divisors (30577317560).

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

20044442440 is a wasteful number, since it uses less digits than its factorization.

20044442440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4951 (or 4947 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 28.

Adding to 20044442440 its reverse (4424444002), we get a palindrome (24468886442).

It can be divided in two parts, 2004 and 4442440, that added together give a palindrome (4444444).

The spelling of 20044442440 in words is "twenty billion, forty-four million, four hundred forty-two thousand, four hundred forty".