20042171 has 8 divisors (see below), whose sum is σ = 20638464. Its totient is φ = 19451880.

The previous prime is 20042117. The next prime is 20042173. The reversal of 20042171 is 17124002.

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 20042171 - 2⁶ = 20042107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20042173) 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, 5786 + ... + 8576.

It is an arithmetic number, because the mean of its divisors is an integer number (2579808).

Almost surely, 2^20042171 is an apocalyptic number.

20042171 is a deficient number, since it is larger than the sum of its proper divisors (596293).

20042171 is a wasteful number, since it uses less digits than its factorization.

20042171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3001.

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 20042171 is about 4476.8483333703. The cubic root of 20042171 is about 271.6324105668.

Adding to 20042171 its reverse (17124002), we get a palindrome (37166173).

The spelling of 20042171 in words is "twenty million, forty-two thousand, one hundred seventy-one".