20556270327805 has 16 divisors (see below), whose sum is σ = 24714887500800. Its totient is φ = 16413454857600.

The previous prime is 20556270327797. The next prime is 20556270327811. The reversal of 20556270327805 is 50872307265502.

It is not a de Polignac number, because 20556270327805 - 2³ = 20556270327797 is a prime.

It is a super-2 number, since 2×20556270327805² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10903836 + ... + 12649354.

It is an arithmetic number, because the mean of its divisors is an integer number (1544680468800).

Almost surely, 2^{20556270327805} is an apocalyptic number.

It is an amenable number.

20556270327805 is a deficient number, since it is larger than the sum of its proper divisors (4158617172995).

20556270327805 is a wasteful number, since it uses less digits than its factorization.

20556270327805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1750044.

The product of its (nonzero) digits is 7056000, while the sum is 52.

The spelling of 20556270327805 in words is "twenty trillion, five hundred fifty-six billion, two hundred seventy million, three hundred twenty-seven thousand, eight hundred five".