20728358 has 8 divisors (see below), whose sum is σ = 35534352. Its totient is φ = 8883576.

The previous prime is 20728339. The next prime is 20728387. The reversal of 20728358 is 85382702.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 740285 + ... + 740312.

It is an arithmetic number, because the mean of its divisors is an integer number (4441794).

Almost surely, 2^20728358 is an apocalyptic number.

20728358 is a deficient number, since it is larger than the sum of its proper divisors (14805994).

20728358 is a wasteful number, since it uses less digits than its factorization.

20728358 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1480606.

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 20728358 is about 4552.8406517250. The cubic root of 20728358 is about 274.6976644277.

The spelling of 20728358 in words is "twenty million, seven hundred twenty-eight thousand, three hundred fifty-eight".