20553620123550 has 96 divisors (see below), whose sum is σ = 51694266355200. Its totient is φ = 5403762453760.

The previous prime is 20553620123527. The next prime is 20553620123551. The reversal of 20553620123550 is 5532102635502.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20553620123499 and 20553620123508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20553620123551) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2414011 + ... + 6850889.

It is an arithmetic number, because the mean of its divisors is an integer number (538481941200).

Almost surely, 2^{20553620123550} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20553620123550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25847133177600).

20553620123550 is an abundant number, since it is smaller than the sum of its proper divisors (31140646231650).

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

20553620123550 is a wasteful number, since it uses less digits than its factorization.

20553620123550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4437330 (or 4437325 counting only the distinct ones).

The product of its (nonzero) digits is 270000, while the sum is 39.

The spelling of 20553620123550 in words is "twenty trillion, five hundred fifty-three billion, six hundred twenty million, one hundred twenty-three thousand, five hundred fifty".