20516205670641 has 40 divisors (see below), whose sum is σ = 30676411713024. Its totient is φ = 13664647149120.

The previous prime is 20516205670627. The next prime is 20516205670651. The reversal of 20516205670641 is 14607650261502.

20516205670641 is a `hidden beast` number, since 2 + 0 + 5 + 1 + 6 + 20 + 567 + 0 + 64 + 1 = 666.

It is not a de Polignac number, because 20516205670641 - 2¹⁸ = 20516205408497 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20516205670651) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 428262496 + ... + 428310398.

Almost surely, 2^{20516205670641} is an apocalyptic number.

It is an amenable number.

20516205670641 is a deficient number, since it is larger than the sum of its proper divisors (10160206042383).

20516205670641 is a wasteful number, since it uses less digits than its factorization.

20516205670641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52763 (or 52754 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 45.

The spelling of 20516205670641 in words is "twenty trillion, five hundred sixteen billion, two hundred five million, six hundred seventy thousand, six hundred forty-one".