20447173 has 4 divisors (see below), whose sum is σ = 21523360. Its totient is φ = 19370988.

The previous prime is 20447159. The next prime is 20447179. The reversal of 20447173 is 37174402.

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 a de Polignac number, because none of the positive numbers 2^k-20447173 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 (20447179) 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, 538065 + ... + 538102.

It is an arithmetic number, because the mean of its divisors is an integer number (5380840).

Almost surely, 2^20447173 is an apocalyptic number.

It is an amenable number.

20447173 is a deficient number, since it is larger than the sum of its proper divisors (1076187).

20447173 is a wasteful number, since it uses less digits than its factorization.

20447173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1076186.

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 20447173 is about 4521.8550396933. The cubic root of 20447173 is about 273.4498926171.

The spelling of 20447173 in words is "twenty million, four hundred forty-seven thousand, one hundred seventy-three".