20285563571856 has 640 divisors, whose sum is σ = 68648806195200. Its totient is φ = 5668766208000.

The previous prime is 20285563571839. The next prime is 20285563571869. The reversal of 20285563571856 is 65817536558202.

It is a happy number.

20285563571856 is a `hidden beast` number, since 2 + 0 + 2 + 8 + 5 + 5 + 6 + 3 + 571 + 8 + 56 = 666.

It is a super-2 number, since 2×20285563571856² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20285563571793 and 20285563571802.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1706527545 + ... + 1706539431.

It is an arithmetic number, because the mean of its divisors is an integer number (107263759680).

Almost surely, 2^{20285563571856} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20285563571856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34324403097600).

20285563571856 is an abundant number, since it is smaller than the sum of its proper divisors (48363242623344).

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

20285563571856 is a wasteful number, since it uses less digits than its factorization.

20285563571856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12436 (or 12424 counting only the distinct ones).

The product of its (nonzero) digits is 120960000, while the sum is 63.

The spelling of 20285563571856 in words is "twenty trillion, two hundred eighty-five billion, five hundred sixty-three million, five hundred seventy-one thousand, eight hundred fifty-six".