20284171 has 4 divisors (see below), whose sum is σ = 20439144. Its totient is φ = 20129200.

The previous prime is 20284151. The next prime is 20284181. The reversal of 20284171 is 17148202.

It is a happy number.

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 20284171 - 2¹³ = 20275979 is a prime.

It is a super-2 number, since 2×20284171² = 822895186314482, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20284151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77290 + ... + 77551.

It is an arithmetic number, because the mean of its divisors is an integer number (5109786).

Almost surely, 2^20284171 is an apocalyptic number.

20284171 is a deficient number, since it is larger than the sum of its proper divisors (154973).

20284171 is a wasteful number, since it uses less digits than its factorization.

20284171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154972.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 20284171 is about 4503.7951774032. The cubic root of 20284171 is about 272.7213183919.

The spelling of 20284171 in words is "twenty million, two hundred eighty-four thousand, one hundred seventy-one".