20843218 has 24 divisors (see below), whose sum is σ = 35182224. Its totient is φ = 9249240.

The previous prime is 20843203. The next prime is 20843219. The reversal of 20843218 is 81234802.

It is not an unprimeable number, because it can be changed into a prime (20843219) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9405 + ... + 11407.

It is an arithmetic number, because the mean of its divisors is an integer number (1465926).

Almost surely, 2^20843218 is an apocalyptic number.

20843218 is a deficient number, since it is larger than the sum of its proper divisors (14339006).

20843218 is a wasteful number, since it uses less digits than its factorization.

20843218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2070 (or 2059 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 20843218 is about 4565.4373284495. The cubic root of 20843218 is about 275.2041151274.

The spelling of 20843218 in words is "twenty million, eight hundred forty-three thousand, two hundred eighteen".