20682728159 has 4 divisors (see below), whose sum is σ = 20693213016. Its totient is φ = 20672243304.

The previous prime is 20682728153. The next prime is 20682728177. The reversal of 20682728159 is 95182728602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20682728159 - 2¹² = 20682724063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20682728153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5239469 + ... + 5243414.

It is an arithmetic number, because the mean of its divisors is an integer number (5173303254).

Almost surely, 2^20682728159 is an apocalyptic number.

20682728159 is a deficient number, since it is larger than the sum of its proper divisors (10484857).

20682728159 is a wasteful number, since it uses less digits than its factorization.

20682728159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10484856.

The product of its (nonzero) digits is 967680, while the sum is 50.

The spelling of 20682728159 in words is "twenty billion, six hundred eighty-two million, seven hundred twenty-eight thousand, one hundred fifty-nine".