20328487 has 8 divisors (see below), whose sum is σ = 20825856. Its totient is φ = 19833912.

The previous prime is 20328479. The next prime is 20328533. The reversal of 20328487 is 78482302.

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

It is a cyclic number.

It is not a de Polignac number, because 20328487 - 2³ = 20328479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20328437) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 24168 + ... + 24994.

It is an arithmetic number, because the mean of its divisors is an integer number (2603232).

Almost surely, 2^20328487 is an apocalyptic number.

20328487 is a deficient number, since it is larger than the sum of its proper divisors (497369).

20328487 is an equidigital number, since it uses as much as digits as its factorization.

20328487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1397.

The product of its (nonzero) digits is 21504, while the sum is 34.

The square root of 20328487 is about 4508.7123438960. The cubic root of 20328487 is about 272.9197839345.

The spelling of 20328487 in words is "twenty million, three hundred twenty-eight thousand, four hundred eighty-seven".