20027861058881 has 16 divisors (see below), whose sum is σ = 21831366246480. Its totient is φ = 18262304670720.

The previous prime is 20027861058857. The next prime is 20027861058937. The reversal of 20027861058881 is 18885016872002.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 866405394481 + 19161455664400 = 930809^2 + 4377380^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20027861058881 is a prime.

It is a super-2 number, since 2×20027861058881² (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 (20027861054881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6929900 + ... + 9385053.

It is an arithmetic number, because the mean of its divisors is an integer number (1364460390405).

Almost surely, 2^{20027861058881} is an apocalyptic number.

It is an amenable number.

20027861058881 is a deficient number, since it is larger than the sum of its proper divisors (1803505187599).

20027861058881 is a wasteful number, since it uses less digits than its factorization.

20027861058881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16316116.

The product of its (nonzero) digits is 3440640, while the sum is 56.

The spelling of 20027861058881 in words is "twenty trillion, twenty-seven billion, eight hundred sixty-one million, fifty-eight thousand, eight hundred eighty-one".