20272171 has 4 divisors (see below), whose sum is σ = 20926144. Its totient is φ = 19618200.

The previous prime is 20272159. The next prime is 20272193. The reversal of 20272171 is 17127202.

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

It is a cyclic number.

It is not a de Polignac number, because 20272171 - 2¹¹ = 20270123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20272471) 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, 326940 + ... + 327001.

It is an arithmetic number, because the mean of its divisors is an integer number (5231536).

Almost surely, 2^20272171 is an apocalyptic number.

20272171 is a deficient number, since it is larger than the sum of its proper divisors (653973).

20272171 is an equidigital number, since it uses as much as digits as its factorization.

20272171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653972.

The product of its (nonzero) digits is 392, while the sum is 22.

The square root of 20272171 is about 4502.4627705290. The cubic root of 20272171 is about 272.6675276570.

Adding to 20272171 its reverse (17127202), we get a palindrome (37399373).

The spelling of 20272171 in words is "twenty million, two hundred seventy-two thousand, one hundred seventy-one".