20671173 has 16 divisors (see below), whose sum is σ = 30925440. Its totient is φ = 13645152.

The previous prime is 20671163. The next prime is 20671187. The reversal of 20671173 is 37117602.

It is not a de Polignac number, because 20671173 - 2⁶ = 20671109 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20671103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 936 + ... + 6497.

It is an arithmetic number, because the mean of its divisors is an integer number (1932840).

Almost surely, 2^20671173 is an apocalyptic number.

It is an amenable number.

20671173 is a deficient number, since it is larger than the sum of its proper divisors (10254267).

20671173 is a wasteful number, since it uses less digits than its factorization.

20671173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7545 (or 7539 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 27.

The square root of 20671173 is about 4546.5561692340. The cubic root of 20671173 is about 274.4448215407. Note that the first 3 decimals are identical.

Adding to 20671173 its reverse (37117602), we get a palindrome (57788775).

It can be divided in two parts, 2067 and 1173, that added together give a triangular number (3240 = T₈₀).

The spelling of 20671173 in words is "twenty million, six hundred seventy-one thousand, one hundred seventy-three".