20724016 has 20 divisors (see below), whose sum is σ = 40390272. Its totient is φ = 10300736.

The previous prime is 20724001. The next prime is 20724017. The reversal of 20724016 is 61042702.

It is not an unprimeable number, because it can be changed into a prime (20724017) 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, 976 + ... + 6511.

Almost surely, 2^20724016 is an apocalyptic number.

It is an amenable number.

20724016 is a deficient number, since it is larger than the sum of its proper divisors (19666256).

20724016 is a wasteful number, since it uses less digits than its factorization.

20724016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7668 (or 7662 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 20724016 is about 4552.3637815974. The cubic root of 20724016 is about 274.6784826454.

Adding to 20724016 its reverse (61042702), we get a palindrome (81766718).

The spelling of 20724016 in words is "twenty million, seven hundred twenty-four thousand, sixteen".