20728359 has 32 divisors (see below), whose sum is σ = 33177600. Its totient is φ = 12751200.

The previous prime is 20728339. The next prime is 20728387. The reversal of 20728359 is 95382702.

It is a happy number.

It is not a de Polignac number, because 20728359 - 2¹⁹ = 20204071 is a prime.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20728339) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17434 + ... + 18584.

It is an arithmetic number, because the mean of its divisors is an integer number (1036800).

Almost surely, 2^20728359 is an apocalyptic number.

20728359 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

20728359 is a deficient number, since it is larger than the sum of its proper divisors (12449241).

20728359 is a wasteful number, since it uses less digits than its factorization.

20728359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1212 (or 1206 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 20728359 is about 4552.8407615466. The cubic root of 20728359 is about 274.6976688451.

The spelling of 20728359 in words is "twenty million, seven hundred twenty-eight thousand, three hundred fifty-nine".