20573573985 has 24 divisors (see below), whose sum is σ = 35752565160. Its totient is φ = 10944356352.

The previous prime is 20573573963. The next prime is 20573574019. The reversal of 20573573985 is 58937537502.

20573573985 is a `hidden beast` number, since 205 + 7 + 357 + 3 + 9 + 85 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 723018321 + 19850555664 = 26889^2 + 140892^2 .

It is not a de Polignac number, because 20573573985 - 2⁶ = 20573573921 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 570144 + ... + 605153.

It is an arithmetic number, because the mean of its divisors is an integer number (1489690215).

Almost surely, 2^20573573985 is an apocalyptic number.

It is an amenable number.

20573573985 is a deficient number, since it is larger than the sum of its proper divisors (15178991175).

20573573985 is a wasteful number, since it uses less digits than its factorization.

20573573985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1175697 (or 1175694 counting only the distinct ones).

The product of its (nonzero) digits is 7938000, while the sum is 54.

The spelling of 20573573985 in words is "twenty billion, five hundred seventy-three million, five hundred seventy-three thousand, nine hundred eighty-five".