20502173 has 8 divisors (see below), whose sum is σ = 21301056. Its totient is φ = 19717600.

The previous prime is 20502169. The next prime is 20502179. The reversal of 20502173 is 37120502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20502173 - 2² = 20502169 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 (20502179) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 611 + ... + 6432.

It is an arithmetic number, because the mean of its divisors is an integer number (2662632).

Almost surely, 2^20502173 is an apocalyptic number.

It is an amenable number.

20502173 is a deficient number, since it is larger than the sum of its proper divisors (798883).

20502173 is an equidigital number, since it uses as much as digits as its factorization.

20502173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7155.

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 20502173 is about 4527.9325304161. The cubic root of 20502173 is about 273.6948536081.

Adding to 20502173 its reverse (37120502), we get a palindrome (57622675).

The spelling of 20502173 in words is "twenty million, five hundred two thousand, one hundred seventy-three".