20405250554424 has 128 divisors (see below), whose sum is σ = 54981096192000. Its totient is φ = 6289982100864.

The previous prime is 20405250554419. The next prime is 20405250554459. The reversal of 20405250554424 is 42445505250402.

It is a happy number.

20405250554424 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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, 31186267 + ... + 31833845.

It is an arithmetic number, because the mean of its divisors is an integer number (429539814000).

Almost surely, 2^{20405250554424} is an apocalyptic number.

20405250554424 is a gapful number since it is divisible by the number (24) 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 20405250554424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27490548096000).

20405250554424 is an abundant number, since it is smaller than the sum of its proper divisors (34575845637576).

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

20405250554424 is a wasteful number, since it uses less digits than its factorization.

20405250554424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649257 (or 649253 counting only the distinct ones).

The product of its (nonzero) digits is 1280000, while the sum is 42.

The spelling of 20405250554424 in words is "twenty trillion, four hundred five billion, two hundred fifty million, five hundred fifty-four thousand, four hundred twenty-four".