20806624 has 24 divisors (see below), whose sum is σ = 41224680. Its totient is φ = 10336896.

The previous prime is 20806619. The next prime is 20806631. The reversal of 20806624 is 42660802.

It is a junction number, because it is equal to n+sod(n) for n = 20806592 and 20806601.

It is a congruent number.

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, 3222 + ... + 7210.

It is an arithmetic number, because the mean of its divisors is an integer number (1717695).

Almost surely, 2^20806624 is an apocalyptic number.

It is an amenable number.

20806624 is a deficient number, since it is larger than the sum of its proper divisors (20418056).

20806624 is a wasteful number, since it uses less digits than its factorization.

20806624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4162 (or 4154 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 20806624 is about 4561.4278466287. The cubic root of 20806624 is about 275.0429640861.

The spelling of 20806624 in words is "twenty million, eight hundred six thousand, six hundred twenty-four".