20517748848 has 160 divisors (see below), whose sum is σ = 59671180800. Its totient is φ = 6749374464.

The previous prime is 20517748843. The next prime is 20517748883. The reversal of 20517748848 is 84884771502.

20517748848 is a `hidden beast` number, since 2 + 0 + 51 + 77 + 488 + 48 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 20517748794 and 20517748803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20517748841) 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 31 ways as a sum of consecutive naturals, for example, 27614365 + ... + 27615107.

It is an arithmetic number, because the mean of its divisors is an integer number (372944880).

Almost surely, 2^20517748848 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20517748848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29835590400).

20517748848 is an abundant number, since it is smaller than the sum of its proper divisors (39153431952).

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

20517748848 is a wasteful number, since it uses less digits than its factorization.

20517748848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1516 (or 1504 counting only the distinct ones).

The product of its (nonzero) digits is 4014080, while the sum is 54.

The spelling of 20517748848 in words is "twenty billion, five hundred seventeen million, seven hundred forty-eight thousand, eight hundred forty-eight".