20682728156 has 24 divisors (see below), whose sum is σ = 38754495360. Its totient is φ = 9623685632.

The previous prime is 20682728153. The next prime is 20682728177. The reversal of 20682728156 is 65182728602.

It is a self number, because there is not a number n which added to its sum of digits gives 20682728156.

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 7 ways as a sum of consecutive naturals, for example, 1702700 + ... + 1714803.

It is an arithmetic number, because the mean of its divisors is an integer number (1614770640).

Almost surely, 2^20682728156 is an apocalyptic number.

It is an amenable number.

20682728156 is a deficient number, since it is larger than the sum of its proper divisors (18071767204).

20682728156 is a wasteful number, since it uses less digits than its factorization.

20682728156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3417613 (or 3417611 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 47.

The spelling of 20682728156 in words is "twenty billion, six hundred eighty-two million, seven hundred twenty-eight thousand, one hundred fifty-six".