20784243 has 8 divisors (see below), whose sum is σ = 27744256. Its totient is φ = 13840200.

The previous prime is 20784241. The next prime is 20784263. The reversal of 20784243 is 34248702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20784243 - 2¹ = 20784241 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20784243.

It is not an unprimeable number, because it can be changed into a prime (20784241) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 523 + ... + 6468.

It is an arithmetic number, because the mean of its divisors is an integer number (3468032).

Almost surely, 2^20784243 is an apocalyptic number.

20784243 is a deficient number, since it is larger than the sum of its proper divisors (6960013).

20784243 is an equidigital number, since it uses as much as digits as its factorization.

20784243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7985.

The product of its (nonzero) digits is 10752, while the sum is 30.

The square root of 20784243 is about 4558.9738977099. The cubic root of 20784243 is about 274.9443104863.

The spelling of 20784243 in words is "twenty million, seven hundred eighty-four thousand, two hundred forty-three".