20216744 has 16 divisors (see below), whose sum is σ = 38622420. Its totient is φ = 9917440.

The previous prime is 20216699. The next prime is 20216759. The reversal of 20216744 is 44761202.

20216744 is nontrivially palindromic in base 14.

It can be written as a sum of positive squares in 2 ways, for example, as 20160100 + 56644 = 4490^2 + 238^2 .

It is an unprimeable number.

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, 23417 + ... + 24264.

Almost surely, 2^20216744 is an apocalyptic number.

It is an amenable number.

20216744 is a deficient number, since it is larger than the sum of its proper divisors (18405676).

20216744 is a wasteful number, since it uses less digits than its factorization.

20216744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47740 (or 47736 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 20216744 is about 4496.3033705479. The cubic root of 20216744 is about 272.4187968913.

Adding to 20216744 its reverse (44761202), we get a palindrome (64977946).

The spelling of 20216744 in words is "twenty million, two hundred sixteen thousand, seven hundred forty-four".