20945784000 has 224 divisors, whose sum is σ = 69855844032. Its totient is φ = 5529600000.

The previous prime is 20945783983. The next prime is 20945784001. The reversal of 20945784000 is 48754902.

It is a self number, because there is not a number n which added to its sum of digits gives 20945784000.

It is not an unprimeable number, because it can be changed into a prime (20945784001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2419680 + ... + 2428320.

Almost surely, 2^20945784000 is an apocalyptic number.

20945784000 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 20945784000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34927922016).

20945784000 is an abundant number, since it is smaller than the sum of its proper divisors (48910060032).

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

20945784000 is a wasteful number, since it uses less digits than its factorization.

20945784000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8772 (or 8752 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 39.

The spelling of 20945784000 in words is "twenty billion, nine hundred forty-five million, seven hundred eighty-four thousand".