20550145440000 has 720 divisors, whose sum is σ = 74681100648000. Its totient is φ = 4973629440000.

The previous prime is 20550145439977. The next prime is 20550145440017. The reversal of 20550145440000 is 4454105502.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a self number, because there is not a number n which added to its sum of digits gives 20550145440000.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 3574557126 + ... + 3574562874.

It is an arithmetic number, because the mean of its divisors is an integer number (103723750900).

Almost surely, 2^{20550145440000} is an apocalyptic number.

20550145440000 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 20550145440000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37340550324000).

20550145440000 is an abundant number, since it is smaller than the sum of its proper divisors (54130955208000).

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

20550145440000 is an equidigital number, since it uses as much as digits as its factorization.

20550145440000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6476 (or 6447 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 30.

Adding to 20550145440000 its reverse (4454105502), we get a palindrome (20554599545502).

The spelling of 20550145440000 in words is "twenty trillion, five hundred fifty billion, one hundred forty-five million, four hundred forty thousand".