20868171 has 4 divisors (see below), whose sum is σ = 27824232. Its totient is φ = 13912112.

The previous prime is 20868157. The next prime is 20868181. The reversal of 20868171 is 17186802.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20868171 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20868121) 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, 3478026 + ... + 3478031.

It is an arithmetic number, because the mean of its divisors is an integer number (6956058).

Almost surely, 2^20868171 is an apocalyptic number.

20868171 is a deficient number, since it is larger than the sum of its proper divisors (6956061).

20868171 is an equidigital number, since it uses as much as digits as its factorization.

20868171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6956060.

The product of its (nonzero) digits is 5376, while the sum is 33.

The square root of 20868171 is about 4568.1693269843. The cubic root of 20868171 is about 275.3138939166.

The spelling of 20868171 in words is "twenty million, eight hundred sixty-eight thousand, one hundred seventy-one".