20085347281 has 2 divisors, whose sum is σ = 20085347282. Its totient is φ = 20085347280.

The previous prime is 20085347273. The next prime is 20085347327. The reversal of 20085347281 is 18274358002.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18955782400 + 1129564881 = 137680^2 + 33609^2 .

It is a cyclic number.

It is not a de Polignac number, because 20085347281 - 2³ = 20085347273 is a prime.

It is a super-2 number, since 2×20085347281² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20085347201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10042673640 + 10042673641.

It is an arithmetic number, because the mean of its divisors is an integer number (10042673641).

Almost surely, 2^20085347281 is an apocalyptic number.

It is an amenable number.

20085347281 is a deficient number, since it is larger than the sum of its proper divisors (1).

20085347281 is an equidigital number, since it uses as much as digits as its factorization.

20085347281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 107520, while the sum is 40.

The spelling of 20085347281 in words is "twenty billion, eighty-five million, three hundred forty-seven thousand, two hundred eighty-one".