20566984585 has 64 divisors (see below), whose sum is σ = 29682132480. Its totient is φ = 13383659520.

The previous prime is 20566984567. The next prime is 20566984597. The reversal of 20566984585 is 58548966502.

It is a happy number.

It is not a de Polignac number, because 20566984585 - 2¹⁵ = 20566951817 is a prime.

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 63 ways as a sum of consecutive naturals, for example, 20302539 + ... + 20303551.

It is an arithmetic number, because the mean of its divisors is an integer number (463783320).

Almost surely, 2^20566984585 is an apocalyptic number.

It is an amenable number.

20566984585 is a deficient number, since it is larger than the sum of its proper divisors (9115147895).

20566984585 is a wasteful number, since it uses less digits than its factorization.

20566984585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1378.

The product of its (nonzero) digits is 20736000, while the sum is 58.

The spelling of 20566984585 in words is "twenty billion, five hundred sixty-six million, nine hundred eighty-four thousand, five hundred eighty-five".