20734173 has 6 divisors (see below), whose sum is σ = 29949374. Its totient is φ = 13822776.

The previous prime is 20734157. The next prime is 20734177. The reversal of 20734173 is 37143702.

It can be written as a sum of positive squares in only one way, i.e., 18429849 + 2304324 = 4293^2 + 1518^2 .

It is not a de Polignac number, because 20734173 - 2⁴ = 20734157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20734177) 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 5 ways as a sum of consecutive naturals, for example, 1151890 + ... + 1151907.

Almost surely, 2^20734173 is an apocalyptic number.

It is an amenable number.

20734173 is a deficient number, since it is larger than the sum of its proper divisors (9215201).

20734173 is a wasteful number, since it uses less digits than its factorization.

20734173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2303803 (or 2303800 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 27.

The square root of 20734173 is about 4553.4792192345. The cubic root of 20734173 is about 274.7233493303.

Adding to 20734173 its reverse (37143702), we get a palindrome (57877875).

The spelling of 20734173 in words is "twenty million, seven hundred thirty-four thousand, one hundred seventy-three".