20191171 has 32 divisors (see below), whose sum is σ = 28320768. Its totient is φ = 13875840.

The previous prime is 20191169. The next prime is 20191177. The reversal of 20191171 is 17119102.

It is not a de Polignac number, because 20191171 - 2¹ = 20191169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20191177) 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, 22585 + ... + 23461.

It is an arithmetic number, because the mean of its divisors is an integer number (885024).

Almost surely, 2^20191171 is an apocalyptic number.

20191171 is a deficient number, since it is larger than the sum of its proper divisors (8129597).

20191171 is a wasteful number, since it uses less digits than its factorization.

20191171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 931.

The product of its (nonzero) digits is 126, while the sum is 22.

The square root of 20191171 is about 4493.4586901406. The cubic root of 20191171 is about 272.3038838042.

It can be divided in two parts, 20 and 191171, that added together give a palindrome (191191).

The spelling of 20191171 in words is "twenty million, one hundred ninety-one thousand, one hundred seventy-one".