20573249858 has 18 divisors (see below), whose sum is σ = 35900699481. Its totient is φ = 8816498544.

The previous prime is 20573249857. The next prime is 20573249863. The reversal of 20573249858 is 85894237502.

It can be written as a sum of positive squares in 2 ways, for example, as 17523670129 + 3049579729 = 132377^2 + 55223^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=101423.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20573249857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1412678 + ... + 1427166.

Almost surely, 2^20573249858 is an apocalyptic number.

20573249858 is a deficient number, since it is larger than the sum of its proper divisors (15327449623).

20573249858 is an frugal number, since it uses more digits than its factorization.

20573249858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28994 (or 14498 counting only the distinct ones).

The product of its (nonzero) digits is 4838400, while the sum is 53.

The spelling of 20573249858 in words is "twenty billion, five hundred seventy-three million, two hundred forty-nine thousand, eight hundred fifty-eight".