20404221444440 has 16 divisors (see below), whose sum is σ = 45909498250080. Its totient is φ = 8161688577760.

The previous prime is 20404221444353. The next prime is 20404221444443. The reversal of 20404221444440 is 4444412240402.

It is a self number, because there is not a number n which added to its sum of digits gives 20404221444440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20404221444443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 255052768016 + ... + 255052768095.

It is an arithmetic number, because the mean of its divisors is an integer number (2869343640630).

Almost surely, 2^{20404221444440} is an apocalyptic number.

20404221444440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20404221444440 is an abundant number, since it is smaller than the sum of its proper divisors (25505276805640).

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

20404221444440 is a wasteful number, since it uses less digits than its factorization.

20404221444440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510105536122 (or 510105536118 counting only the distinct ones).

The product of its (nonzero) digits is 131072, while the sum is 35.

Adding to 20404221444440 its reverse (4444412240402), we get a palindrome (24848633684842).

The spelling of 20404221444440 in words is "twenty trillion, four hundred four billion, two hundred twenty-one million, four hundred forty-four thousand, four hundred forty".