20398171 has 8 divisors (see below), whose sum is σ = 21578400. Its totient is φ = 19242432.

The previous prime is 20398139. The next prime is 20398193. The reversal of 20398171 is 17189302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20398171 - 2⁵ = 20398139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20398121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4396 + ... + 7753.

It is an arithmetic number, because the mean of its divisors is an integer number (2697300).

Almost surely, 2^20398171 is an apocalyptic number.

20398171 is a deficient number, since it is larger than the sum of its proper divisors (1180229).

20398171 is a wasteful number, since it uses less digits than its factorization.

20398171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12245.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 20398171 is about 4516.4334380128. The cubic root of 20398171 is about 273.2312754350.

The spelling of 20398171 in words is "twenty million, three hundred ninety-eight thousand, one hundred seventy-one".