20328290 has 32 divisors (see below), whose sum is σ = 38949120. Its totient is φ = 7617024.

The previous prime is 20328257. The next prime is 20328307. The reversal of 20328290 is 9282302.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17879 + ... + 18981.

It is an arithmetic number, because the mean of its divisors is an integer number (1217160).

Almost surely, 2^20328290 is an apocalyptic number.

20328290 is a deficient number, since it is larger than the sum of its proper divisors (18620830).

20328290 is a wasteful number, since it uses less digits than its factorization.

20328290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1226.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 20328290 is about 4508.6904972508. The cubic root of 20328290 is about 272.9189023249.

The spelling of 20328290 in words is "twenty million, three hundred twenty-eight thousand, two hundred ninety".