20681324 has 12 divisors (see below), whose sum is σ = 37766064. Its totient is φ = 9891024.

The previous prime is 20681317. The next prime is 20681327. The reversal of 20681324 is 42318602.

It is a junction number, because it is equal to n+sod(n) for n = 20681293 and 20681302.

It is not an unprimeable number, because it can be changed into a prime (20681327) by changing a digit.

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, 112307 + ... + 112490.

It is an arithmetic number, because the mean of its divisors is an integer number (3147172).

Almost surely, 2^20681324 is an apocalyptic number.

It is an amenable number.

20681324 is a deficient number, since it is larger than the sum of its proper divisors (17084740).

20681324 is a wasteful number, since it uses less digits than its factorization.

20681324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224824 (or 224822 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 20681324 is about 4547.6723716644. The cubic root of 20681324 is about 274.4897380932.

Adding to 20681324 its reverse (42318602), we get a palindrome (62999926).

The spelling of 20681324 in words is "twenty million, six hundred eighty-one thousand, three hundred twenty-four".