20333701681 has 2 divisors, whose sum is σ = 20333701682. Its totient is φ = 20333701680.

The previous prime is 20333701673. The next prime is 20333701709. The reversal of 20333701681 is 18610733302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19714687281 + 619014400 = 140409^2 + 24880^2 .

It is a cyclic number.

It is not a de Polignac number, because 20333701681 - 2³ = 20333701673 is a prime.

It is a super-2 number, since 2×20333701681² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20333701601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10166850840 + 10166850841.

It is an arithmetic number, because the mean of its divisors is an integer number (10166850841).

Almost surely, 2^20333701681 is an apocalyptic number.

It is an amenable number.

20333701681 is a deficient number, since it is larger than the sum of its proper divisors (1).

20333701681 is an equidigital number, since it uses as much as digits as its factorization.

20333701681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 34.

The spelling of 20333701681 in words is "twenty billion, three hundred thirty-three million, seven hundred one thousand, six hundred eighty-one".