20506066571504 has 20 divisors (see below), whose sum is σ = 39732074956176. Its totient is φ = 10252627873152.

The previous prime is 20506066571491. The next prime is 20506066571527. The reversal of 20506066571504 is 40517566060502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24920789 + ... + 25730484.

Almost surely, 2^{20506066571504} is an apocalyptic number.

It is an amenable number.

20506066571504 is a deficient number, since it is larger than the sum of its proper divisors (19226008384672).

20506066571504 is a wasteful number, since it uses less digits than its factorization.

20506066571504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50676584 (or 50676578 counting only the distinct ones).

The product of its (nonzero) digits is 1512000, while the sum is 47.

The spelling of 20506066571504 in words is "twenty trillion, five hundred six billion, sixty-six million, five hundred seventy-one thousand, five hundred four".