20542573523889 has 12 divisors (see below), whose sum is σ = 29677048960000. Its totient is φ = 13692998511864.

The previous prime is 20542573523863. The next prime is 20542573523897. The reversal of 20542573523889 is 98832537524502.

It is a happy number.

20542573523889 is a `hidden beast` number, since 2 + 0 + 5 + 4 + 2 + 573 + 52 + 3 + 8 + 8 + 9 = 666.

It is not a de Polignac number, because 20542573523889 - 2²¹ = 20542571426737 is a prime.

It is a super-3 number, since 3×20542573523889³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20542573123889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 170811889 + ... + 170932110.

Almost surely, 2^{20542573523889} is an apocalyptic number.

It is an amenable number.

20542573523889 is a deficient number, since it is larger than the sum of its proper divisors (9134475436111).

20542573523889 is a wasteful number, since it uses less digits than its factorization.

20542573523889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341750684 (or 341750681 counting only the distinct ones).

The product of its (nonzero) digits is 145152000, while the sum is 63.

The spelling of 20542573523889 in words is "twenty trillion, five hundred forty-two billion, five hundred seventy-three million, five hundred twenty-three thousand, eight hundred eighty-nine".