20328287 has 12 divisors (see below), whose sum is σ = 23721120. Its totient is φ = 17369856.

The previous prime is 20328257. The next prime is 20328307. The reversal of 20328287 is 78282302.

It is not a de Polignac number, because 20328287 - 2¹⁴ = 20311903 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 (20328257) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27914 + ... + 28632.

It is an arithmetic number, because the mean of its divisors is an integer number (1976760).

Almost surely, 2^20328287 is an apocalyptic number.

20328287 is a deficient number, since it is larger than the sum of its proper divisors (3392833).

20328287 is an equidigital number, since it uses as much as digits as its factorization.

20328287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1310 (or 1303 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 20328287 is about 4508.6901645600. The cubic root of 20328287 is about 272.9188888993.

The spelling of 20328287 in words is "twenty million, three hundred twenty-eight thousand, two hundred eighty-seven".