20784673 has 24 divisors (see below), whose sum is σ = 26480832. Its totient is φ = 16166304.

The previous prime is 20784671. The next prime is 20784683. The reversal of 20784673 is 37648702.

It is not a de Polignac number, because 20784673 - 2¹ = 20784671 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20784671) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 42436 + ... + 42922.

It is an arithmetic number, because the mean of its divisors is an integer number (1103368).

Almost surely, 2^20784673 is an apocalyptic number.

It is an amenable number.

20784673 is a deficient number, since it is larger than the sum of its proper divisors (5696159).

20784673 is a wasteful number, since it uses less digits than its factorization.

20784673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581 (or 574 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 37.

The square root of 20784673 is about 4559.0210572008. The cubic root of 20784673 is about 274.9462065579.

The spelling of 20784673 in words is "twenty million, seven hundred eighty-four thousand, six hundred seventy-three".