20682728157 has 32 divisors (see below), whose sum is σ = 34633580800. Its totient is φ = 10909563840.

The previous prime is 20682728153. The next prime is 20682728177. The reversal of 20682728157 is 75182728602.

It is not a de Polignac number, because 20682728157 - 2² = 20682728153 is a prime.

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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 759694 + ... + 786447.

It is an arithmetic number, because the mean of its divisors is an integer number (1082299400).

Almost surely, 2^20682728157 is an apocalyptic number.

It is an amenable number.

20682728157 is a deficient number, since it is larger than the sum of its proper divisors (13950852643).

20682728157 is a wasteful number, since it uses less digits than its factorization.

20682728157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1546178 (or 1546164 counting only the distinct ones).

The product of its (nonzero) digits is 752640, while the sum is 48.

The spelling of 20682728157 in words is "twenty billion, six hundred eighty-two million, seven hundred twenty-eight thousand, one hundred fifty-seven".