20447568561072 has 80 divisors (see below), whose sum is σ = 53352863064288. Its totient is φ = 6747489638400.

The previous prime is 20447568560977. The next prime is 20447568561089. The reversal of 20447568561072 is 27016586574402.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37314538 + ... + 37858550.

Almost surely, 2^{20447568561072} 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 20447568561072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26676431532144).

20447568561072 is an abundant number, since it is smaller than the sum of its proper divisors (32905294503216).

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

20447568561072 is a wasteful number, since it uses less digits than its factorization.

20447568561072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551878 (or 551872 counting only the distinct ones).

The product of its (nonzero) digits is 22579200, while the sum is 57.

The spelling of 20447568561072 in words is "twenty trillion, four hundred forty-seven billion, five hundred sixty-eight million, five hundred sixty-one thousand, seventy-two".