20828173 has 4 divisors (see below), whose sum is σ = 20853280. Its totient is φ = 20803068.

The previous prime is 20828153. The next prime is 20828189. The reversal of 20828173 is 37182802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20828173 - 2¹⁷ = 20697101 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 (20828153) 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, 11265 + ... + 12982.

It is an arithmetic number, because the mean of its divisors is an integer number (5213320).

Almost surely, 2^20828173 is an apocalyptic number.

It is an amenable number.

20828173 is a deficient number, since it is larger than the sum of its proper divisors (25107).

20828173 is an equidigital number, since it uses as much as digits as its factorization.

20828173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25106.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 20828173 is about 4563.7893246731. The cubic root of 20828173 is about 275.1378834715.

The spelling of 20828173 in words is "twenty million, eight hundred twenty-eight thousand, one hundred seventy-three".