20320781854600 has 96 divisors (see below), whose sum is σ = 48419756874720. Its totient is φ = 7926932805120.

The previous prime is 20320781854553. The next prime is 20320781854601. The reversal of 20320781854600 is 645818702302.

It is not an unprimeable number, because it can be changed into a prime (20320781854601) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3692412 + ... + 7367188.

It is an arithmetic number, because the mean of its divisors is an integer number (504372467445).

Almost surely, 2^{20320781854600} is an apocalyptic number.

20320781854600 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 20320781854600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24209878437360).

20320781854600 is an abundant number, since it is smaller than the sum of its proper divisors (28098975020120).

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

20320781854600 is a wasteful number, since it uses less digits than its factorization.

20320781854600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3675479 (or 3675470 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 46.

The spelling of 20320781854600 in words is "twenty trillion, three hundred twenty billion, seven hundred eighty-one million, eight hundred fifty-four thousand, six hundred".