20686710204645 has 8 divisors (see below), whose sum is σ = 33098736327456. Its totient is φ = 11032912109136.

The previous prime is 20686710204613. The next prime is 20686710204707. The reversal of 20686710204645 is 54640201768602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20686710204645 - 2⁵ = 20686710204613 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 689557006807 + ... + 689557006836.

It is an arithmetic number, because the mean of its divisors is an integer number (4137342040932).

Almost surely, 2^{20686710204645} is an apocalyptic number.

It is an amenable number.

20686710204645 is a deficient number, since it is larger than the sum of its proper divisors (12412026122811).

20686710204645 is a wasteful number, since it uses less digits than its factorization.

20686710204645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1379114013651.

The product of its (nonzero) digits is 3870720, while the sum is 51.

The spelling of 20686710204645 in words is "twenty trillion, six hundred eighty-six billion, seven hundred ten million, two hundred four thousand, six hundred forty-five".