20179782656 has 88 divisors (see below), whose sum is σ = 46323773760. Its totient is φ = 8689766400.

The previous prime is 20179782641. The next prime is 20179782719. The reversal of 20179782656 is 65628797102.

It is a tau number, because it is divible by the number of its divisors (88).

It is a junction number, because it is equal to n+sod(n) for n = 20179782598 and 20179782607.

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 7 ways as a sum of consecutive naturals, for example, 166871 + ... + 261161.

It is an arithmetic number, because the mean of its divisors is an integer number (526406520).

Almost surely, 2^20179782656 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 20179782656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23161886880).

20179782656 is an abundant number, since it is smaller than the sum of its proper divisors (26143991104).

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

20179782656 is a wasteful number, since it uses less digits than its factorization.

20179782656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94341 (or 94323 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 53.

The spelling of 20179782656 in words is "twenty billion, one hundred seventy-nine million, seven hundred eighty-two thousand, six hundred fifty-six".