20665065105600 has 168 divisors, whose sum is σ = 67801911954960. Its totient is φ = 5510417633280.

The previous prime is 20665065105589. The next prime is 20665065105611. The reversal of 20665065105600 is 650156056602.

It is an interprime number because it is at equal distance from previous prime (20665065105589) and next prime (20665065105611).

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 23 ways as a sum of consecutive naturals, for example, 111713986 + ... + 111898814.

Almost surely, 2^{20665065105600} is an apocalyptic number.

20665065105600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20665065105600 is an abundant number, since it is smaller than the sum of its proper divisors (47136846849360).

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

20665065105600 is a wasteful number, since it uses less digits than its factorization.

20665065105600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208147 (or 208132 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 42.

The spelling of 20665065105600 in words is "twenty trillion, six hundred sixty-five billion, sixty-five million, one hundred five thousand, six hundred".