20185456447568 has 10 divisors (see below), whose sum is σ = 39109321867194. Its totient is φ = 10092728223776.

The previous prime is 20185456447567. The next prime is 20185456447693. The reversal of 20185456447568 is 86574465458102.

It can be written as a sum of positive squares in only one way, i.e., 18625335541264 + 1560120906304 = 4315708^2 + 1249048^2 .

It is a super-2 number, since 2×20185456447568² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20185456447567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630795513971 + ... + 630795514002.

Almost surely, 2^{20185456447568} is an apocalyptic number.

It is an amenable number.

20185456447568 is a deficient number, since it is larger than the sum of its proper divisors (18923865419626).

20185456447568 is a wasteful number, since it uses less digits than its factorization.

20185456447568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1261591027981 (or 1261591027975 counting only the distinct ones).

The product of its (nonzero) digits is 258048000, while the sum is 65.

The spelling of 20185456447568 in words is "twenty trillion, one hundred eighty-five billion, four hundred fifty-six million, four hundred forty-seven thousand, five hundred sixty-eight".