20556717590205 has 48 divisors (see below), whose sum is σ = 35712651199680. Its totient is φ = 10938661473024.

The previous prime is 20556717590197. The next prime is 20556717590251. The reversal of 20556717590205 is 50209571765502.

20556717590205 is a `hidden beast` number, since 2 + 0 + 5 + 567 + 1 + 7 + 59 + 0 + 20 + 5 = 666.

It is not a de Polignac number, because 20556717590205 - 2³ = 20556717590197 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 289581406 + ... + 289652384.

It is an arithmetic number, because the mean of its divisors is an integer number (744013566660).

Almost surely, 2^{20556717590205} is an apocalyptic number.

It is an amenable number.

20556717590205 is a deficient number, since it is larger than the sum of its proper divisors (15155933609475).

20556717590205 is a wasteful number, since it uses less digits than its factorization.

20556717590205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85530 (or 85527 counting only the distinct ones).

The product of its (nonzero) digits is 6615000, while the sum is 54.

The spelling of 20556717590205 in words is "twenty trillion, five hundred fifty-six billion, seven hundred seventeen million, five hundred ninety thousand, two hundred five".