20291328 has 54 divisors (see below), whose sum is σ = 58511544. Its totient is φ = 6763008.

The previous prime is 20291317. The next prime is 20291371. The reversal of 20291328 is 82319202.

It is a happy number.

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 5 ways as a sum of consecutive naturals, for example, 2100 + ... + 6707.

Almost surely, 2^20291328 is an apocalyptic number.

It is an amenable number.

20291328 is an abundant number, since it is smaller than the sum of its proper divisors (38220216).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20291328 is an equidigital number, since it uses as much as digits as its factorization.

20291328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8829 (or 8812 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 20291328 is about 4504.5896594474. The cubic root of 20291328 is about 272.7533899837.

The spelling of 20291328 in words is "twenty million, two hundred ninety-one thousand, three hundred twenty-eight".