20505066663120 has 80 divisors (see below), whose sum is σ = 68455376408832. Its totient is φ = 5047401024000.

The previous prime is 20505066663113. The next prime is 20505066663227. The reversal of 20505066663120 is 2136666050502.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3286065256 + ... + 3286071495.

Almost surely, 2^{20505066663120} is an apocalyptic number.

20505066663120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20505066663120 is an abundant number, since it is smaller than the sum of its proper divisors (47950309745712).

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

20505066663120 is a wasteful number, since it uses less digits than its factorization.

20505066663120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6572136780 (or 6572136774 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 42.

The spelling of 20505066663120 in words is "twenty trillion, five hundred five billion, sixty-six million, six hundred sixty-three thousand, one hundred twenty".