20281384 has 16 divisors (see below), whose sum is σ = 38095200. Its totient is φ = 10122672.

The previous prime is 20281381. The next prime is 20281397. The reversal of 20281384 is 48318202.

It is a super-2 number, since 2×20281384² = 822669073910912, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20281381) 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 3 ways as a sum of consecutive naturals, for example, 3349 + ... + 7195.

It is an arithmetic number, because the mean of its divisors is an integer number (2380950).

Almost surely, 2^20281384 is an apocalyptic number.

It is an amenable number.

20281384 is a deficient number, since it is larger than the sum of its proper divisors (17813816).

20281384 is a wasteful number, since it uses less digits than its factorization.

20281384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4512 (or 4508 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 20281384 is about 4503.4857610522. The cubic root of 20281384 is about 272.7088273855.

Adding to 20281384 its reverse (48318202), we get a palindrome (68599586).

The spelling of 20281384 in words is "twenty million, two hundred eighty-one thousand, three hundred eighty-four".