20694936899680 has 24 divisors (see below), whose sum is σ = 48891788425872. Its totient is φ = 8277974759808.

The previous prime is 20694936899641. The next prime is 20694936899683. The reversal of 20694936899680 is 8699863949602.

It is a self number, because there is not a number n which added to its sum of digits gives 20694936899680.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20694936899683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64671677652 + ... + 64671677971.

It is an arithmetic number, because the mean of its divisors is an integer number (2037157851078).

Almost surely, 2^{20694936899680} is an apocalyptic number.

20694936899680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20694936899680 is an abundant number, since it is smaller than the sum of its proper divisors (28196851526192).

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

20694936899680 is a wasteful number, since it uses less digits than its factorization.

20694936899680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129343355638 (or 129343355630 counting only the distinct ones).

The product of its (nonzero) digits is 2176782336, while the sum is 79.

The spelling of 20694936899680 in words is "twenty trillion, six hundred ninety-four billion, nine hundred thirty-six million, eight hundred ninety-nine thousand, six hundred eighty".