20516170565156 has 48 divisors (see below), whose sum is σ = 41246499235200. Its totient is φ = 8746756945920.

The previous prime is 20516170565117. The next prime is 20516170565167. The reversal of 20516170565156 is 65156507161502.

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, 189891191 + ... + 189999201.

It is an arithmetic number, because the mean of its divisors is an integer number (859302067400).

Almost surely, 2^{20516170565156} is an apocalyptic number.

It is an amenable number.

20516170565156 is an abundant number, since it is smaller than the sum of its proper divisors (20730328670044).

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

20516170565156 is a wasteful number, since it uses less digits than its factorization.

20516170565156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143364 (or 143362 counting only the distinct ones).

The product of its (nonzero) digits is 1890000, while the sum is 50.

The spelling of 20516170565156 in words is "twenty trillion, five hundred sixteen billion, one hundred seventy million, five hundred sixty-five thousand, one hundred fifty-six".