20284843 has 4 divisors (see below), whose sum is σ = 20833120. Its totient is φ = 19736568.

The previous prime is 20284841. The next prime is 20284883. The reversal of 20284843 is 34848202.

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 20284843 - 2¹ = 20284841 is a prime.

It is a super-2 number, since 2×20284843² = 822949711069298, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20284841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 274083 + ... + 274156.

It is an arithmetic number, because the mean of its divisors is an integer number (5208280).

Almost surely, 2^20284843 is an apocalyptic number.

20284843 is a deficient number, since it is larger than the sum of its proper divisors (548277).

20284843 is an equidigital number, since it uses as much as digits as its factorization.

20284843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548276.

The product of its (nonzero) digits is 12288, while the sum is 31.

The square root of 20284843 is about 4503.8697805332. The cubic root of 20284843 is about 272.7243300457.

The spelling of 20284843 in words is "twenty million, two hundred eighty-four thousand, eight hundred forty-three".