20712443673897 has 18 divisors (see below), whose sum is σ = 31781377436718. Its totient is φ = 12996043087872.

The previous prime is 20712443673893. The next prime is 20712443673899. The reversal of 20712443673897 is 79837634421702.

20712443673897 is a `hidden beast` number, since 2 + 0 + 7 + 1 + 244 + 3 + 6 + 7 + 389 + 7 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 13926189431961 + 6786254241936 = 3731781^2 + 2605044^2 .

It is not a de Polignac number, because 20712443673897 - 2² = 20712443673893 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20712443673893) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3981628248 + ... + 3981633449.

Almost surely, 2^{20712443673897} is an apocalyptic number.

It is an amenable number.

20712443673897 is a deficient number, since it is larger than the sum of its proper divisors (11068933762821).

20712443673897 is a wasteful number, since it uses less digits than its factorization.

20712443673897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7963261737 (or 7963261717 counting only the distinct ones).

The product of its (nonzero) digits is 85349376, while the sum is 63.

The spelling of 20712443673897 in words is "twenty trillion, seven hundred twelve billion, four hundred forty-three million, six hundred seventy-three thousand, eight hundred ninety-seven".