20550171 has 4 divisors (see below), whose sum is σ = 27400232. Its totient is φ = 13700112.

The previous prime is 20550121. The next prime is 20550199. The reversal of 20550171 is 17105502.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20550171 - 2¹⁴ = 20533787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20550121) 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, 3425026 + ... + 3425031.

It is an arithmetic number, because the mean of its divisors is an integer number (6850058).

Almost surely, 2^20550171 is an apocalyptic number.

20550171 is a deficient number, since it is larger than the sum of its proper divisors (6850061).

20550171 is an equidigital number, since it uses as much as digits as its factorization.

20550171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6850060.

The product of its (nonzero) digits is 350, while the sum is 21.

The square root of 20550171 is about 4533.2296434220. The cubic root of 20550171 is about 273.9082711044.

Adding to 20550171 its reverse (17105502), we get a palindrome (37655673).

The spelling of 20550171 in words is "twenty million, five hundred fifty thousand, one hundred seventy-one".