20784797547720 has 32 divisors (see below), whose sum is σ = 62354392643520. Its totient is φ = 5542612679360.

The previous prime is 20784797547673. The next prime is 20784797547721. The reversal of 20784797547720 is 2774579748702.

It is not an unprimeable number, because it can be changed into a prime (20784797547721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86603322996 + ... + 86603323235.

It is an arithmetic number, because the mean of its divisors is an integer number (1948574770110).

Almost surely, 2^{20784797547720} is an apocalyptic number.

20784797547720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20784797547720 is an abundant number, since it is smaller than the sum of its proper divisors (41569595095800).

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

20784797547720 is a wasteful number, since it uses less digits than its factorization.

20784797547720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173206646245 (or 173206646241 counting only the distinct ones).

The product of its (nonzero) digits is 387233280, while the sum is 69.

The spelling of 20784797547720 in words is "twenty trillion, seven hundred eighty-four billion, seven hundred ninety-seven million, five hundred forty-seven thousand, seven hundred twenty".