20686705433321 has 8 divisors (see below), whose sum is σ = 20734354396800. Its totient is φ = 20639058864480.

The previous prime is 20686705433309. The next prime is 20686705433323. The reversal of 20686705433321 is 12333450768602.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20686705433321 - 2¹⁰ = 20686705432297 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20686705433321.

It is not an unprimeable number, because it can be changed into a prime (20686705433323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17315141 + ... + 18471261.

It is an arithmetic number, because the mean of its divisors is an integer number (2591794299600).

Almost surely, 2^{20686705433321} is an apocalyptic number.

It is an amenable number.

20686705433321 is a deficient number, since it is larger than the sum of its proper divisors (47648963479).

20686705433321 is a wasteful number, since it uses less digits than its factorization.

20686705433321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1197319.

The product of its (nonzero) digits is 4354560, while the sum is 50.

The spelling of 20686705433321 in words is "twenty trillion, six hundred eighty-six billion, seven hundred five million, four hundred thirty-three thousand, three hundred twenty-one".