20505772127184 has 40 divisors (see below), whose sum is σ = 53023078514112. Its totient is φ = 6828827201280.

The previous prime is 20505772127131. The next prime is 20505772127233. The reversal of 20505772127184 is 48172127750502.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 200891397 + ... + 200993444.

Almost surely, 2^{20505772127184} is an apocalyptic number.

20505772127184 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20505772127184 is an abundant number, since it is smaller than the sum of its proper divisors (32517306386928).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20505772127184 is a wasteful number, since it uses less digits than its factorization.

20505772127184 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401885915 (or 401885909 counting only the distinct ones).

The product of its (nonzero) digits is 2195200, while the sum is 51.

Adding to 20505772127184 its reverse (48172127750502), we get a palindrome (68677899877686).

The spelling of 20505772127184 in words is "twenty trillion, five hundred five billion, seven hundred seventy-two million, one hundred twenty-seven thousand, one hundred eighty-four".