20646874209688 has 16 divisors (see below), whose sum is σ = 38712939490080. Its totient is φ = 10323423679008.

The previous prime is 20646874209673. The next prime is 20646874209701. The reversal of 20646874209688 is 88690247864602.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 8460970 + ... + 10624582.

It is an arithmetic number, because the mean of its divisors is an integer number (2419558718130).

Almost surely, 2^{20646874209688} is an apocalyptic number.

It is an amenable number.

20646874209688 is a deficient number, since it is larger than the sum of its proper divisors (18066065280392).

20646874209688 is a wasteful number, since it uses less digits than its factorization.

20646874209688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3356466 (or 3356462 counting only the distinct ones).

The product of its (nonzero) digits is 445906944, while the sum is 70.

The spelling of 20646874209688 in words is "twenty trillion, six hundred forty-six billion, eight hundred seventy-four million, two hundred nine thousand, six hundred eighty-eight".