20550665245440 has 864 divisors, whose sum is σ = 72765080720640. Its totient is φ = 4939249582080.

The previous prime is 20550665245387. The next prime is 20550665245463. The reversal of 20550665245440 is 4454256605502.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 20550665245440.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 49046933551 + ... + 49046933969.

Almost surely, 2^{20550665245440} is an apocalyptic number.

20550665245440 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 20550665245440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36382540360320).

20550665245440 is an abundant number, since it is smaller than the sum of its proper divisors (52214415475200).

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

20550665245440 is a wasteful number, since it uses less digits than its factorization.

20550665245440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1121 (or 1096 counting only the distinct ones).

The product of its (nonzero) digits is 5760000, while the sum is 48.

The spelling of 20550665245440 in words is "twenty trillion, five hundred fifty billion, six hundred sixty-five million, two hundred forty-five thousand, four hundred forty".