20673456678 has 48 divisors (see below), whose sum is σ = 51380399616. Its totient is φ = 5884896240.

The previous prime is 20673456677. The next prime is 20673456703. The reversal of 20673456678 is 87665437602.

20673456678 is a `hidden beast` number, since 2 + 0 + 6 + 7 + 3 + 4 + 566 + 78 = 666.

It is a super-2 number, since 2×20673456678² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20673456677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 268576 + ... + 336867.

It is an arithmetic number, because the mean of its divisors is an integer number (1070424992).

Almost surely, 2^20673456678 is an apocalyptic number.

20673456678 is an abundant number, since it is smaller than the sum of its proper divisors (30706942938).

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

20673456678 is a wasteful number, since it uses less digits than its factorization.

20673456678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605729 (or 605726 counting only the distinct ones).

The product of its (nonzero) digits is 10160640, while the sum is 54.

The spelling of 20673456678 in words is "twenty billion, six hundred seventy-three million, four hundred fifty-six thousand, six hundred seventy-eight".