20814171 has 24 divisors (see below), whose sum is σ = 34186320. Its totient is φ = 11192832.

The previous prime is 20814169. The next prime is 20814191. The reversal of 20814171 is 17141802.

It is not a de Polignac number, because 20814171 - 2¹ = 20814169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20814161) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1666 + ... + 6663.

It is an arithmetic number, because the mean of its divisors is an integer number (1424430).

Almost surely, 2^20814171 is an apocalyptic number.

20814171 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20814171 is a deficient number, since it is larger than the sum of its proper divisors (13372149).

20814171 is a wasteful number, since it uses less digits than its factorization.

20814171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8363 (or 8356 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 24.

The square root of 20814171 is about 4562.2550345197. The cubic root of 20814171 is about 275.0762146883.

Adding to 20814171 its reverse (17141802), we get a palindrome (37955973).

The spelling of 20814171 in words is "twenty million, eight hundred fourteen thousand, one hundred seventy-one".