20728571237 has 16 divisors (see below), whose sum is σ = 22691672640. Its totient is φ = 18778694400.

The previous prime is 20728571231. The next prime is 20728571239. The reversal of 20728571237 is 73217582702.

It is a cyclic number.

It is not a de Polignac number, because 20728571237 - 2⁶ = 20728571173 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 (20728571231) 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 15 ways as a sum of consecutive naturals, for example, 5194439 + ... + 5198427.

It is an arithmetic number, because the mean of its divisors is an integer number (1418229540).

Almost surely, 2^20728571237 is an apocalyptic number.

It is an amenable number.

20728571237 is a deficient number, since it is larger than the sum of its proper divisors (1963101403).

20728571237 is a wasteful number, since it uses less digits than its factorization.

20728571237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5524.

The product of its (nonzero) digits is 329280, while the sum is 44.

The spelling of 20728571237 in words is "twenty billion, seven hundred twenty-eight million, five hundred seventy-one thousand, two hundred thirty-seven".