20728353 has 8 divisors (see below), whose sum is σ = 28159488. Its totient is φ = 13558064.

The previous prime is 20728339. The next prime is 20728387. The reversal of 20728353 is 35382702.

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

It is a cyclic number.

It is not a de Polignac number, because 20728353 - 2⁶ = 20728289 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20728353.

It is not an unprimeable number, because it can be changed into a prime (20728153) 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, 65025 + ... + 65342.

It is an arithmetic number, because the mean of its divisors is an integer number (3519936).

Almost surely, 2^20728353 is an apocalyptic number.

It is an amenable number.

20728353 is a deficient number, since it is larger than the sum of its proper divisors (7431135).

20728353 is a wasteful number, since it uses less digits than its factorization.

20728353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130423.

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 20728353 is about 4552.8401026173. The cubic root of 20728353 is about 274.6976423406.

The spelling of 20728353 in words is "twenty million, seven hundred twenty-eight thousand, three hundred fifty-three".