20320173 has 16 divisors (see below), whose sum is σ = 30312000. Its totient is φ = 13453200.

The previous prime is 20320171. The next prime is 20320187. The reversal of 20320173 is 37102302.

It is not a de Polignac number, because 20320173 - 2¹ = 20320171 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20320171) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1498 + ... + 6548.

It is an arithmetic number, because the mean of its divisors is an integer number (1894500).

Almost surely, 2^20320173 is an apocalyptic number.

It is an amenable number.

20320173 is a deficient number, since it is larger than the sum of its proper divisors (9991827).

20320173 is a wasteful number, since it uses less digits than its factorization.

20320173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5209 (or 5203 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 18.

The square root of 20320173 is about 4507.7902568775. The cubic root of 20320173 is about 272.8825723688.

Adding to 20320173 its reverse (37102302), we get a palindrome (57422475).

The spelling of 20320173 in words is "twenty million, three hundred twenty thousand, one hundred seventy-three".