20323287 has 12 divisors (see below), whose sum is σ = 30368520. Its totient is φ = 13081488.

The previous prime is 20323271. The next prime is 20323291. The reversal of 20323287 is 78232302.

It is not a de Polignac number, because 20323287 - 2⁴ = 20323271 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20323287.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20323267) 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, 38673 + ... + 39194.

It is an arithmetic number, because the mean of its divisors is an integer number (2530710).

Almost surely, 2^20323287 is an apocalyptic number.

20323287 is a deficient number, since it is larger than the sum of its proper divisors (10045233).

20323287 is a wasteful number, since it uses less digits than its factorization.

20323287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77902 (or 77899 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 20323287 is about 4508.1356456966. The cubic root of 20323287 is about 272.8965111105.

Adding to 20323287 its reverse (78232302), we get a palindrome (98555589).

The spelling of 20323287 in words is "twenty million, three hundred twenty-three thousand, two hundred eighty-seven".