20653216 has 24 divisors (see below), whose sum is σ = 40770324. Its totient is φ = 10298880.

The previous prime is 20653189. The next prime is 20653229. The reversal of 20653216 is 61235602.

It can be written as a sum of positive squares in 2 ways, for example, as 20611600 + 41616 = 4540^2 + 204^2 .

It is a super-2 number, since 2×20653216² = 853110662285312, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16716 + ... + 17908.

Almost surely, 2^20653216 is an apocalyptic number.

It is an amenable number.

20653216 is a deficient number, since it is larger than the sum of its proper divisors (20117108).

20653216 is a wasteful number, since it uses less digits than its factorization.

20653216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1744 (or 1736 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 20653216 is about 4544.5809487784. The cubic root of 20653216 is about 274.3653286580.

Adding to 20653216 its reverse (61235602), we get a palindrome (81888818).

The spelling of 20653216 in words is "twenty million, six hundred fifty-three thousand, two hundred sixteen".