20328805 has 16 divisors (see below), whose sum is σ = 28298880. Its totient is φ = 13730112.

The previous prime is 20328793. The next prime is 20328811. The reversal of 20328805 is 50882302.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20328805 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1990 + ... + 6679.

It is an arithmetic number, because the mean of its divisors is an integer number (1768680).

Almost surely, 2^20328805 is an apocalyptic number.

It is an amenable number.

20328805 is a deficient number, since it is larger than the sum of its proper divisors (7970075).

20328805 is an equidigital number, since it uses as much as digits as its factorization.

20328805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8748.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 20328805 is about 4508.7476088156. The cubic root of 20328805 is about 272.9212070284.

The spelling of 20328805 in words is "twenty million, three hundred twenty-eight thousand, eight hundred five".