20784424 has 16 divisors (see below), whose sum is σ = 39032820. Its totient is φ = 10375680.

The previous prime is 20784409. The next prime is 20784443. The reversal of 20784424 is 42448702.

It can be written as a sum of positive squares in 2 ways, for example, as 20412324 + 372100 = 4518^2 + 610^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4504 + ... + 7864.

Almost surely, 2^20784424 is an apocalyptic number.

It is an amenable number.

20784424 is a deficient number, since it is larger than the sum of its proper divisors (18248396).

20784424 is a wasteful number, since it uses less digits than its factorization.

20784424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4140 (or 4136 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 31.

The square root of 20784424 is about 4558.9937486248. The cubic root of 20784424 is about 274.9451086034.

The spelling of 20784424 in words is "twenty million, seven hundred eighty-four thousand, four hundred twenty-four".