20887550320000 has 640 divisors, whose sum is σ = 64093559745600. Its totient is φ = 6600683520000.

The previous prime is 20887550319991. The next prime is 20887550320001. The reversal of 20887550320000 is 2305578802.

It is a tau number, because it is divible by the number of its divisors (640).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20887550320001) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 6035118270 + ... + 6035121730.

Almost surely, 2^{20887550320000} is an apocalyptic number.

20887550320000 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 20887550320000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32046779872800).

20887550320000 is an abundant number, since it is smaller than the sum of its proper divisors (43206009425600).

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

20887550320000 is an equidigital number, since it uses as much as digits as its factorization.

20887550320000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4344 (or 4317 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 40.

Adding to 20887550320000 its reverse (2305578802), we get a palindrome (20889855898802).

The spelling of 20887550320000 in words is "twenty trillion, eight hundred eighty-seven billion, five hundred fifty million, three hundred twenty thousand".