20212173 has 10 divisors (see below), whose sum is σ = 30193614. Its totient is φ = 13474728.

The previous prime is 20212151. The next prime is 20212183. The reversal of 20212173 is 37121202.

It can be written as a sum of positive squares in only one way, i.e., 15468489 + 4743684 = 3933^2 + 2178^2 .

It is not a de Polignac number, because 20212173 - 2⁹ = 20211661 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212103) 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 9 ways as a sum of consecutive naturals, for example, 124686 + ... + 124847.

Almost surely, 2^20212173 is an apocalyptic number.

It is an amenable number.

20212173 is a deficient number, since it is larger than the sum of its proper divisors (9981441).

20212173 is an equidigital number, since it uses as much as digits as its factorization.

20212173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249545 (or 249536 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 20212173 is about 4495.7950353636. The cubic root of 20212173 is about 272.3982640732.

Adding to 20212173 its reverse (37121202), we get a palindrome (57333375).

The spelling of 20212173 in words is "twenty million, two hundred twelve thousand, one hundred seventy-three".