20171879 has 12 divisors (see below), whose sum is σ = 25271064. Its totient is φ = 15959664.

The previous prime is 20171873. The next prime is 20171887. The reversal of 20171879 is 97817102.

It is not a de Polignac number, because 20171879 - 2²⁴ = 3394663 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20171873) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15197 + ... + 16470.

It is an arithmetic number, because the mean of its divisors is an integer number (2105922).

Almost surely, 2^20171879 is an apocalyptic number.

20171879 is a deficient number, since it is larger than the sum of its proper divisors (5099185).

20171879 is a wasteful number, since it uses less digits than its factorization.

20171879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31694 (or 31687 counting only the distinct ones).

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

The square root of 20171879 is about 4491.3115011097. The cubic root of 20171879 is about 272.2171303658.

The spelling of 20171879 in words is "twenty million, one hundred seventy-one thousand, eight hundred seventy-nine".