20563622979840 has 864 divisors, whose sum is σ = 75187304704512. Its totient is φ = 5379747840000.

The previous prime is 20563622979829. The next prime is 20563622979853. The reversal of 20563622979840 is 4897922636502.

It is a happy number.

20563622979840 is a `hidden beast` number, since 2 + 0 + 563 + 6 + 2 + 29 + 7 + 9 + 8 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (864).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 8746754665 + ... + 8746757015.

It is an arithmetic number, because the mean of its divisors is an integer number (87022343408).

Almost surely, 2^{20563622979840} is an apocalyptic number.

20563622979840 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 20563622979840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37593652352256).

20563622979840 is an abundant number, since it is smaller than the sum of its proper divisors (54623681724672).

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

20563622979840 is an equidigital number, since it uses as much as digits as its factorization.

20563622979840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2909 (or 2883 counting only the distinct ones).

The product of its (nonzero) digits is 78382080, while the sum is 63.

The spelling of 20563622979840 in words is "twenty trillion, five hundred sixty-three billion, six hundred twenty-two million, nine hundred seventy-nine thousand, eight hundred forty".