20624216 has 8 divisors (see below), whose sum is σ = 38670420. Its totient is φ = 10312104.

The previous prime is 20624209. The next prime is 20624239. The reversal of 20624216 is 61242602.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×20624216² = 850716571229312, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20624191 and 20624200.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 1289006 + ... + 1289021.

Almost surely, 2^20624216 is an apocalyptic number.

It is an amenable number.

20624216 is a deficient number, since it is larger than the sum of its proper divisors (18046204).

20624216 is a wasteful number, since it uses less digits than its factorization.

20624216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2578033 (or 2578029 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 20624216 is about 4541.3892147668. The cubic root of 20624216 is about 274.2368527587.

Adding to 20624216 its reverse (61242602), we get a palindrome (81866818).

The spelling of 20624216 in words is "twenty million, six hundred twenty-four thousand, two hundred sixteen".