20879171 has 4 divisors (see below), whose sum is σ = 20902392. Its totient is φ = 20855952.

The previous prime is 20879167. The next prime is 20879203. The reversal of 20879171 is 17197802.

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 20879171 - 2² = 20879167 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20879161) 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, 10205 + ... + 12078.

It is an arithmetic number, because the mean of its divisors is an integer number (5225598).

Almost surely, 2^20879171 is an apocalyptic number.

20879171 is a deficient number, since it is larger than the sum of its proper divisors (23221).

20879171 is an equidigital number, since it uses as much as digits as its factorization.

20879171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23220.

The product of its (nonzero) digits is 7056, while the sum is 35.

The square root of 20879171 is about 4569.3731517573. The cubic root of 20879171 is about 275.3622597727.

The spelling of 20879171 in words is "twenty million, eight hundred seventy-nine thousand, one hundred seventy-one".