20875560984 has 192 divisors, whose sum is σ = 62270208000. Its totient is φ = 6293859840.

The previous prime is 20875560931. The next prime is 20875560991. The reversal of 20875560984 is 48906557802.

20875560984 is a `hidden beast` number, since 2 + 0 + 8 + 7 + 556 + 0 + 9 + 84 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 20875560984.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2632177 + ... + 2640095.

It is an arithmetic number, because the mean of its divisors is an integer number (324324000).

Almost surely, 2^20875560984 is an apocalyptic number.

20875560984 is a gapful number since it is divisible by the number (24) 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 20875560984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31135104000).

20875560984 is an abundant number, since it is smaller than the sum of its proper divisors (41394647016).

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

20875560984 is a wasteful number, since it uses less digits than its factorization.

20875560984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8038 (or 8031 counting only the distinct ones).

The product of its (nonzero) digits is 4838400, while the sum is 54.

The spelling of 20875560984 in words is "twenty billion, eight hundred seventy-five million, five hundred sixty thousand, nine hundred eighty-four".