20684477182649 has 12 divisors (see below), whose sum is σ = 24063307683444. Its totient is φ = 17728245448704.

The previous prime is 20684477182591. The next prime is 20684477182753. The reversal of 20684477182649 is 94628177448602.

It can be written as a sum of positive squares in 2 ways, for example, as 8659083087424 + 12025394095225 = 2942632^2 + 3467765^2 .

It is a de Polignac number, because none of the positive numbers 2^k-20684477182649 is a prime.

It is a super-2 number, since 2×20684477182649² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20684477142649) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14880584 + ... + 16211129.

It is an arithmetic number, because the mean of its divisors is an integer number (2005275640287).

Almost surely, 2^{20684477182649} is an apocalyptic number.

It is an amenable number.

20684477182649 is a deficient number, since it is larger than the sum of its proper divisors (3378830500795).

20684477182649 is a wasteful number, since it uses less digits than its factorization.

20684477182649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31105304 (or 31105297 counting only the distinct ones).

The product of its (nonzero) digits is 260112384, while the sum is 68.

The spelling of 20684477182649 in words is "twenty trillion, six hundred eighty-four billion, four hundred seventy-seven million, one hundred eighty-two thousand, six hundred forty-nine".