20728065 has 8 divisors (see below), whose sum is σ = 33164928. Its totient is φ = 11054960.

The previous prime is 20728063. The next prime is 20728067. The reversal of 20728065 is 56082702.

It is an interprime number because it is at equal distance from previous prime (20728063) and next prime (20728067).

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

It is not a de Polignac number, because 20728065 - 2¹ = 20728063 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20728061) 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, 690921 + ... + 690950.

It is an arithmetic number, because the mean of its divisors is an integer number (4145616).

Almost surely, 2^20728065 is an apocalyptic number.

It is an amenable number.

20728065 is a deficient number, since it is larger than the sum of its proper divisors (12436863).

20728065 is a wasteful number, since it uses less digits than its factorization.

20728065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1381879.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 20728065 is about 4552.8084738983. The cubic root of 20728065 is about 274.6963701172.

The spelling of 20728065 in words is "twenty million, seven hundred twenty-eight thousand, sixty-five".