20680170784 has 96 divisors (see below), whose sum is σ = 50206093056. Its totient is φ = 8165422080.

The previous prime is 20680170701. The next prime is 20680170799. The reversal of 20680170784 is 48707108602.

It is a self number, because there is not a number n which added to its sum of digits gives 20680170784.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1568829 + ... + 1581955.

It is an arithmetic number, because the mean of its divisors is an integer number (522980136).

Almost surely, 2^20680170784 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 20680170784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25103046528).

20680170784 is an abundant number, since it is smaller than the sum of its proper divisors (29525922272).

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

20680170784 is a wasteful number, since it uses less digits than its factorization.

20680170784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13698 (or 13690 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 43.

The spelling of 20680170784 in words is "twenty billion, six hundred eighty million, one hundred seventy thousand, seven hundred eighty-four".