20028860081 has 2 divisors, whose sum is σ = 20028860082. Its totient is φ = 20028860080.

The previous prime is 20028860041. The next prime is 20028860087. The reversal of 20028860081 is 18006882002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17529760000 + 2499100081 = 132400^2 + 49991^2 .

It is a cyclic number.

It is not a de Polignac number, because 20028860081 - 2²² = 20024665777 is a prime.

It is a super-3 number, since 3×20028860081³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (20028860087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10014430040 + 10014430041.

It is an arithmetic number, because the mean of its divisors is an integer number (10014430041).

Almost surely, 2^20028860081 is an apocalyptic number.

It is an amenable number.

20028860081 is a deficient number, since it is larger than the sum of its proper divisors (1).

20028860081 is an equidigital number, since it uses as much as digits as its factorization.

20028860081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12288, while the sum is 35.

The spelling of 20028860081 in words is "twenty billion, twenty-eight million, eight hundred sixty thousand, eighty-one".