20218442 has 8 divisors (see below), whose sum is σ = 30472032. Its totient is φ = 10061100.

The previous prime is 20218441. The next prime is 20218459. The reversal of 20218442 is 24481202.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 23534 + ... + 24377.

It is an arithmetic number, because the mean of its divisors is an integer number (3809004).

Almost surely, 2^20218442 is an apocalyptic number.

20218442 is a deficient number, since it is larger than the sum of its proper divisors (10253590).

20218442 is a wasteful number, since it uses less digits than its factorization.

20218442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48124.

The product of its (nonzero) digits is 1024, while the sum is 23.

The square root of 20218442 is about 4496.4921883619. The cubic root of 20218442 is about 272.4264234766.

Adding to 20218442 its reverse (24481202), we get a palindrome (44699644).

The spelling of 20218442 in words is "twenty million, two hundred eighteen thousand, four hundred forty-two".