20873609575866 has 64 divisors (see below), whose sum is σ = 47413470873600. Its totient is φ = 6803973712368.

The previous prime is 20873609575859. The next prime is 20873609575877. The reversal of 20873609575866 is 66857590637802.

It is a happy number.

20873609575866 is a `hidden beast` number, since 2 + 0 + 8 + 7 + 3 + 609 + 5 + 7 + 5 + 8 + 6 + 6 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 20873609575794 and 20873609575803.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 584176 + ... + 6487563.

It is an arithmetic number, because the mean of its divisors is an integer number (740835482400).

Almost surely, 2^{20873609575866} is an apocalyptic number.

20873609575866 is an abundant number, since it is smaller than the sum of its proper divisors (26539861297734).

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

20873609575866 is a wasteful number, since it uses less digits than its factorization.

20873609575866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7072960 (or 7072954 counting only the distinct ones).

The product of its (nonzero) digits is 914457600, while the sum is 72.

The spelling of 20873609575866 in words is "twenty trillion, eight hundred seventy-three billion, six hundred nine million, five hundred seventy-five thousand, eight hundred sixty-six".