20704073 has 4 divisors (see below), whose sum is σ = 22296708. Its totient is φ = 19111440.

The previous prime is 20704043. The next prime is 20704081. The reversal of 20704073 is 37040702.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13564489 + 7139584 = 3683^2 + 2672^2 .

It is a cyclic number.

It is not a de Polignac number, because 20704073 - 2²² = 16509769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20704043) 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, 796298 + ... + 796323.

It is an arithmetic number, because the mean of its divisors is an integer number (5574177).

Almost surely, 2^20704073 is an apocalyptic number.

It is an amenable number.

20704073 is a deficient number, since it is larger than the sum of its proper divisors (1592635).

20704073 is a wasteful number, since it uses less digits than its factorization.

20704073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1592634.

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

The square root of 20704073 is about 4550.1728538595. The cubic root of 20704073 is about 274.5903454318.

Adding to 20704073 its reverse (37040702), we get a palindrome (57744775).

The spelling of 20704073 in words is "twenty million, seven hundred four thousand, seventy-three".