20712643854685 has 16 divisors (see below), whose sum is σ = 25205754292992. Its totient is φ = 16336403395200.

The previous prime is 20712643854641. The next prime is 20712643854701. The reversal of 20712643854685 is 58645834621702.

It is not a de Polignac number, because 20712643854685 - 2¹⁷ = 20712643723613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17832040 + ... + 18958030.

It is an arithmetic number, because the mean of its divisors is an integer number (1575359643312).

Almost surely, 2^{20712643854685} is an apocalyptic number.

It is an amenable number.

20712643854685 is a deficient number, since it is larger than the sum of its proper divisors (4493110438307).

20712643854685 is a wasteful number, since it uses less digits than its factorization.

20712643854685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1177884.

The product of its (nonzero) digits is 77414400, while the sum is 61.

The spelling of 20712643854685 in words is "twenty trillion, seven hundred twelve billion, six hundred forty-three million, eight hundred fifty-four thousand, six hundred eighty-five".