20215173 has 32 divisors (see below), whose sum is σ = 30707712. Its totient is φ = 11721600.

The previous prime is 20215171. The next prime is 20215211. The reversal of 20215173 is 37151202.

It is not a de Polignac number, because 20215173 - 2¹ = 20215171 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20215171) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 90540 + ... + 90762.

It is an arithmetic number, because the mean of its divisors is an integer number (959616).

Almost surely, 2^20215173 is an apocalyptic number.

It is an amenable number.

20215173 is a deficient number, since it is larger than the sum of its proper divisors (10492539).

20215173 is a wasteful number, since it uses less digits than its factorization.

20215173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 20215173 is about 4496.1286680877. The cubic root of 20215173 is about 272.4117403476.

Adding to 20215173 its reverse (37151202), we get a palindrome (57366375).

The spelling of 20215173 in words is "twenty million, two hundred fifteen thousand, one hundred seventy-three".