20555444550000 has 240 divisors, whose sum is σ = 66404579522400. Its totient is φ = 5478819840000.

The previous prime is 20555444549993. The next prime is 20555444550023. The reversal of 20555444550000 is 5544455502.

It is a tau number, because it is divible by the number of its divisors (240).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 322918176 + ... + 322981824.

It is an arithmetic number, because the mean of its divisors is an integer number (276685748010).

Almost surely, 2^{20555444550000} is an apocalyptic number.

20555444550000 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 20555444550000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33202289761200).

20555444550000 is an abundant number, since it is smaller than the sum of its proper divisors (45849134972400).

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

20555444550000 is an equidigital number, since it uses as much as digits as its factorization.

20555444550000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65838 (or 65812 counting only the distinct ones).

The product of its (nonzero) digits is 400000, while the sum is 39.

The spelling of 20555444550000 in words is "twenty trillion, five hundred fifty-five billion, four hundred forty-four million, five hundred fifty thousand".