20565520551072 has 192 divisors, whose sum is σ = 68558489475840. Its totient is φ = 5875284077568.

The previous prime is 20565520551053. The next prime is 20565520551151. The reversal of 20565520551072 is 27015502556502.

20565520551072 is a `hidden beast` number, since 2 + 0 + 5 + 6 + 5 + 5 + 20 + 551 + 0 + 72 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 63202618 + ... + 63527174.

It is an arithmetic number, because the mean of its divisors is an integer number (357075466020).

Almost surely, 2^{20565520551072} 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 20565520551072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34279244737920).

20565520551072 is an abundant number, since it is smaller than the sum of its proper divisors (47992968924768).

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

20565520551072 is a wasteful number, since it uses less digits than its factorization.

20565520551072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335060 (or 335046 counting only the distinct ones).

The product of its (nonzero) digits is 1050000, while the sum is 45.

The spelling of 20565520551072 in words is "twenty trillion, five hundred sixty-five billion, five hundred twenty million, five hundred fifty-one thousand, seventy-two".