20297328 has 20 divisors (see below), whose sum is σ = 52434888. Its totient is φ = 6765760.

The previous prime is 20297317. The next prime is 20297341. The reversal of 20297328 is 82379202.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 211383 + ... + 211478.

Almost surely, 2^20297328 is an apocalyptic number.

It is an amenable number.

20297328 is an abundant number, since it is smaller than the sum of its proper divisors (32137560).

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

20297328 is a wasteful number, since it uses less digits than its factorization.

20297328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422872 (or 422866 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 20297328 is about 4505.2555976326. The cubic root of 20297328 is about 272.7802710740.

The spelling of 20297328 in words is "twenty million, two hundred ninety-seven thousand, three hundred twenty-eight".