20681173361853 has 24 divisors (see below), whose sum is σ = 30113876302848. Its totient is φ = 13676227875072.

The previous prime is 20681173361843. The next prime is 20681173361869. The reversal of 20681173361853 is 35816337118602.

20681173361853 is a `hidden beast` number, since 2 + 0 + 6 + 8 + 1 + 17 + 3 + 3 + 618 + 5 + 3 = 666.

It is not a de Polignac number, because 20681173361853 - 2⁹ = 20681173361341 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20681173361853.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20681173361833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4134226 + ... + 7645532.

It is an arithmetic number, because the mean of its divisors is an integer number (1254744845952).

Almost surely, 2^{20681173361853} is an apocalyptic number.

It is an amenable number.

20681173361853 is a deficient number, since it is larger than the sum of its proper divisors (9432702940995).

20681173361853 is a wasteful number, since it uses less digits than its factorization.

20681173361853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3516593 (or 3516590 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 54.

The spelling of 20681173361853 in words is "twenty trillion, six hundred eighty-one billion, one hundred seventy-three million, three hundred sixty-one thousand, eight hundred fifty-three".