20704921923840 has 1152 divisors, whose sum is σ = 85441832017920. Its totient is φ = 4146384076800.

The previous prime is 20704921923797. The next prime is 20704921923857. The reversal of 20704921923840 is 4832912940702.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 5496393637 + ... + 5496397403.

It is an arithmetic number, because the mean of its divisors is an integer number (74168256960).

Almost surely, 2^{20704921923840} is an apocalyptic number.

20704921923840 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 20704921923840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42720916008960).

20704921923840 is an abundant number, since it is smaller than the sum of its proper divisors (64736910094080).

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

20704921923840 is a wasteful number, since it uses less digits than its factorization.

20704921923840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4479 (or 4465 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 51.

The spelling of 20704921923840 in words is "twenty trillion, seven hundred four billion, nine hundred twenty-one million, nine hundred twenty-three thousand, eight hundred forty".