20297171 has 4 divisors (see below), whose sum is σ = 20306232. Its totient is φ = 20288112.

The previous prime is 20297143. The next prime is 20297177. The reversal of 20297171 is 17179202.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20297171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20297177) 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, 1556 + ... + 6558.

It is an arithmetic number, because the mean of its divisors is an integer number (5076558).

Almost surely, 2^20297171 is an apocalyptic number.

20297171 is a deficient number, since it is larger than the sum of its proper divisors (9061).

20297171 is an equidigital number, since it uses as much as digits as its factorization.

20297171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9060.

The product of its (nonzero) digits is 1764, while the sum is 29.

The square root of 20297171 is about 4505.2381735043. The cubic root of 20297171 is about 272.7795677530.

The spelling of 20297171 in words is "twenty million, two hundred ninety-seven thousand, one hundred seventy-one".