20218446 has 12 divisors (see below), whose sum is σ = 43806672. Its totient is φ = 6739476.

The previous prime is 20218441. The next prime is 20218459. The reversal of 20218446 is 64481202.

20218446 is a `hidden beast` number, since 2 + 0 + 218 + 446 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20218441) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 561606 + ... + 561641.

It is an arithmetic number, because the mean of its divisors is an integer number (3650556).

Almost surely, 2^20218446 is an apocalyptic number.

20218446 is an abundant number, since it is smaller than the sum of its proper divisors (23588226).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20218446 is a wasteful number, since it uses less digits than its factorization.

20218446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1123255 (or 1123252 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 20218446 is about 4496.4926331531. The cubic root of 20218446 is about 272.4264414422.

Adding to 20218446 its reverse (64481202), we get a palindrome (84699648).

The spelling of 20218446 in words is "twenty million, two hundred eighteen thousand, four hundred forty-six".