20185545664000 has 80 divisors (see below), whose sum is σ = 50333919869376. Its totient is φ = 8074218240000.

The previous prime is 20185545663977. The next prime is 20185545664033. The reversal of 20185545664000 is 46654558102.

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 7 ways as a sum of consecutive naturals, for example, 157635576 + ... + 157763575.

Almost surely, 2^{20185545664000} is an apocalyptic number.

20185545664000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20185545664000 is an abundant number, since it is smaller than the sum of its proper divisors (30148374205376).

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

20185545664000 is an frugal number, since it uses more digits than its factorization.

20185545664000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315399184 (or 315399158 counting only the distinct ones).

The product of its (nonzero) digits is 1152000, while the sum is 46.

The spelling of 20185545664000 in words is "twenty trillion, one hundred eighty-five billion, five hundred forty-five million, six hundred sixty-four thousand".