20784748 has 6 divisors (see below), whose sum is σ = 36373316. Its totient is φ = 10392372.

The previous prime is 20784733. The next prime is 20784767. The reversal of 20784748 is 84748702.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20784748.

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, 2598090 + ... + 2598097.

Almost surely, 2^20784748 is an apocalyptic number.

It is an amenable number.

20784748 is a deficient number, since it is larger than the sum of its proper divisors (15588568).

20784748 is a wasteful number, since it uses less digits than its factorization.

20784748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5196191 (or 5196189 counting only the distinct ones).

The product of its (nonzero) digits is 100352, while the sum is 40.

The square root of 20784748 is about 4559.0292826434. The cubic root of 20784748 is about 274.9465372654.

The spelling of 20784748 in words is "twenty million, seven hundred eighty-four thousand, seven hundred forty-eight".