20456523505566 has 48 divisors (see below), whose sum is σ = 44735518370400. Its totient is φ = 6755312862144.

The previous prime is 20456523505507. The next prime is 20456523505573. The reversal of 20456523505566 is 66550532565402.

20456523505566 is a `hidden beast` number, since 2 + 0 + 4 + 5 + 6 + 5 + 23 + 50 + 5 + 566 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12983055 + ... + 14473173.

It is an arithmetic number, because the mean of its divisors is an integer number (931989966050).

Almost surely, 2^{20456523505566} is an apocalyptic number.

20456523505566 is an abundant number, since it is smaller than the sum of its proper divisors (24278994864834).

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

20456523505566 is a wasteful number, since it uses less digits than its factorization.

20456523505566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1497233 (or 1497230 counting only the distinct ones).

The product of its (nonzero) digits is 32400000, while the sum is 54.

The spelling of 20456523505566 in words is "twenty trillion, four hundred fifty-six billion, five hundred twenty-three million, five hundred five thousand, five hundred sixty-six".