20813824 has 24 divisors (see below), whose sum is σ = 41621580. Its totient is φ = 10405888.

The previous prime is 20813813. The next prime is 20813839. The reversal of 20813824 is 42831802.

It is a junction number, because it is equal to n+sod(n) for n = 20813792 and 20813801.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3034 + ... + 7129.

Almost surely, 2^20813824 is an apocalyptic number.

It is an amenable number.

20813824 is a deficient number, since it is larger than the sum of its proper divisors (20807756).

20813824 is an equidigital number, since it uses as much as digits as its factorization.

20813824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10185 (or 10165 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 20813824 is about 4562.2170049221. The cubic root of 20813824 is about 275.0746860506.

The spelling of 20813824 in words is "twenty million, eight hundred thirteen thousand, eight hundred twenty-four".