20681173361854 has 8 divisors (see below), whose sum is σ = 31025008083168. Its totient is φ = 10339504000800.

The previous prime is 20681173361843. The next prime is 20681173361869. The reversal of 20681173361854 is 45816337118602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 20681173361795 and 20681173361804.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 541316187 + ... + 541354390.

It is an arithmetic number, because the mean of its divisors is an integer number (3878126010396).

Almost surely, 2^{20681173361854} is an apocalyptic number.

20681173361854 is a deficient number, since it is larger than the sum of its proper divisors (10343834721314).

20681173361854 is a wasteful number, since it uses less digits than its factorization.

20681173361854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1082680130.

The product of its (nonzero) digits is 5806080, while the sum is 55.

The spelling of 20681173361854 in words is "twenty trillion, six hundred eighty-one billion, one hundred seventy-three million, three hundred sixty-one thousand, eight hundred fifty-four".