20424454225440 has 192 divisors, whose sum is σ = 64452673192320. Its totient is φ = 5436739051520.

The previous prime is 20424454225423. The next prime is 20424454225463. The reversal of 20424454225440 is 4452245442402.

It is a junction number, because it is equal to n+sod(n) for n = 20424454225392 and 20424454225401.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 740512450 + ... + 740540030.

It is an arithmetic number, because the mean of its divisors is an integer number (335691006210).

Almost surely, 2^{20424454225440} is an apocalyptic number.

20424454225440 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 20424454225440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32226336596160).

20424454225440 is an abundant number, since it is smaller than the sum of its proper divisors (44028218966880).

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

20424454225440 is a wasteful number, since it uses less digits than its factorization.

20424454225440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30315 (or 30307 counting only the distinct ones).

The product of its (nonzero) digits is 1638400, while the sum is 42.

Adding to 20424454225440 its reverse (4452245442402), we get a palindrome (24876699667842).

The spelling of 20424454225440 in words is "twenty trillion, four hundred twenty-four billion, four hundred fifty-four million, two hundred twenty-five thousand, four hundred forty".