20017036681 has 2 divisors, whose sum is σ = 20017036682. Its totient is φ = 20017036680.

The previous prime is 20017036673. The next prime is 20017036747. The reversal of 20017036681 is 18663071002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14337907081 + 5679129600 = 119741^2 + 75360^2 .

It is a cyclic number.

It is not a de Polignac number, because 20017036681 - 2³ = 20017036673 is a prime.

It is a super-2 number, since 2×20017036681² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20017036651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10008518340 + 10008518341.

It is an arithmetic number, because the mean of its divisors is an integer number (10008518341).

Almost surely, 2^20017036681 is an apocalyptic number.

It is an amenable number.

20017036681 is a deficient number, since it is larger than the sum of its proper divisors (1).

20017036681 is an equidigital number, since it uses as much as digits as its factorization.

20017036681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 34.

The spelling of 20017036681 in words is "twenty billion, seventeen million, thirty-six thousand, six hundred eighty-one".