20644566176 has 96 divisors (see below), whose sum is σ = 45157447440. Its totient is φ = 9228681216.

The previous prime is 20644566133. The next prime is 20644566191. The reversal of 20644566176 is 67166544602.

It can be written as a sum of positive squares in 8 ways, for example, as 19677356176 + 967210000 = 140276^2 + 31100^2 .

It is a super-2 number, since 2×20644566176² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20644566176.

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, 3521840 + ... + 3527696.

Almost surely, 2^20644566176 is an apocalyptic number.

20644566176 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20644566176, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22578723720).

20644566176 is an abundant number, since it is smaller than the sum of its proper divisors (24512881264).

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

20644566176 is a wasteful number, since it uses less digits than its factorization.

20644566176 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6146 (or 6138 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 47.

The spelling of 20644566176 in words is "twenty billion, six hundred forty-four million, five hundred sixty-six thousand, one hundred seventy-six".