20444040551040 has 128 divisors (see below), whose sum is σ = 65187798364800. Its totient is φ = 5449868562432.

The previous prime is 20444040551029. The next prime is 20444040551041. The reversal of 20444040551040 is 4015504044402.

It is a tau number, because it is divible by the number of its divisors (128).

It is a junction number, because it is equal to n+sod(n) for n = 20444040550992 and 20444040551010.

It is not an unprimeable number, because it can be changed into a prime (20444040551041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3755109 + ... + 7415451.

It is an arithmetic number, because the mean of its divisors is an integer number (509279674725).

Almost surely, 2^{20444040551040} is an apocalyptic number.

20444040551040 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 20444040551040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32593899182400).

20444040551040 is an abundant number, since it is smaller than the sum of its proper divisors (44743757813760).

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

20444040551040 is a wasteful number, since it uses less digits than its factorization.

20444040551040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3663274 (or 3663262 counting only the distinct ones).

The product of its (nonzero) digits is 51200, while the sum is 33.

Adding to 20444040551040 its reverse (4015504044402), we get a palindrome (24459544595442).

The spelling of 20444040551040 in words is "twenty trillion, four hundred forty-four billion, forty million, five hundred fifty-one thousand, forty".