20714791681 has 2 divisors, whose sum is σ = 20714791682. Its totient is φ = 20714791680.

The previous prime is 20714791679. The next prime is 20714791693. The reversal of 20714791681 is 18619741702.

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., 16025281281 + 4689510400 = 126591^2 + 68480^2 .

It is a cyclic number.

It is not a de Polignac number, because 20714791681 - 2¹ = 20714791679 is a prime.

It is a super-2 number, since 2×20714791681² (a number of 21 digits) contains 22 as substring.

Together with 20714791679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20714791651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10357395840 + 10357395841.

It is an arithmetic number, because the mean of its divisors is an integer number (10357395841).

Almost surely, 2^20714791681 is an apocalyptic number.

It is an amenable number.

20714791681 is a deficient number, since it is larger than the sum of its proper divisors (1).

20714791681 is an equidigital number, since it uses as much as digits as its factorization.

20714791681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 169344, while the sum is 46.

The spelling of 20714791681 in words is "twenty billion, seven hundred fourteen million, seven hundred ninety-one thousand, six hundred eighty-one".