20704307 has 4 divisors (see below), whose sum is σ = 22296960. Its totient is φ = 19111656.

The previous prime is 20704279. The next prime is 20704309. The reversal of 20704307 is 70340702.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70340702 = 2 ⋅35170351.

It is a cyclic number.

It is not a de Polignac number, because 20704307 - 2¹⁶ = 20638771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20704309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 796307 + ... + 796332.

It is an arithmetic number, because the mean of its divisors is an integer number (5574240).

Almost surely, 2^20704307 is an apocalyptic number.

20704307 is a deficient number, since it is larger than the sum of its proper divisors (1592653).

20704307 is a wasteful number, since it uses less digits than its factorization.

20704307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1592652.

The product of its (nonzero) digits is 1176, while the sum is 23.

The square root of 20704307 is about 4550.1985670957. The cubic root of 20704307 is about 274.5913799126.

The spelling of 20704307 in words is "twenty million, seven hundred four thousand, three hundred seven".