20556116027473 has 16 divisors (see below), whose sum is σ = 22152767147280. Its totient is φ = 18961669188864.

The previous prime is 20556116027471. The next prime is 20556116027509. The reversal of 20556116027473 is 37472061165502.

It can be written as a sum of positive squares in 8 ways, for example, as 8230202781889 + 12325913245584 = 2868833^2 + 3510828^2 .

It is a cyclic number.

It is not a de Polignac number, because 20556116027473 - 2¹ = 20556116027471 is a prime.

It is a super-2 number, since 2×20556116027473² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20556116027471) by changing a digit.

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, 206608783 + ... + 206708251.

It is an arithmetic number, because the mean of its divisors is an integer number (1384547946705).

Almost surely, 2^{20556116027473} is an apocalyptic number.

It is an amenable number.

20556116027473 is a deficient number, since it is larger than the sum of its proper divisors (1596651119807).

20556116027473 is a wasteful number, since it uses less digits than its factorization.

20556116027473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110388.

The product of its (nonzero) digits is 2116800, while the sum is 49.

The spelling of 20556116027473 in words is "twenty trillion, five hundred fifty-six billion, one hundred sixteen million, twenty-seven thousand, four hundred seventy-three".