20728315 has 8 divisors (see below), whose sum is σ = 24919488. Its totient is φ = 16552320.

The previous prime is 20728291. The next prime is 20728339. The reversal of 20728315 is 51382702.

It is an interprime number because it is at equal distance from previous prime (20728291) and next prime (20728339).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20728315 - 2⁵ = 20728283 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 531 + ... + 6460.

It is an arithmetic number, because the mean of its divisors is an integer number (3114936).

Almost surely, 2^20728315 is an apocalyptic number.

20728315 is a deficient number, since it is larger than the sum of its proper divisors (4191173).

20728315 is an equidigital number, since it uses as much as digits as its factorization.

20728315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7589.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 20728315 is about 4552.8359293961. The cubic root of 20728315 is about 274.6974744784.

The spelling of 20728315 in words is "twenty million, seven hundred twenty-eight thousand, three hundred fifteen".