20218342 has 16 divisors (see below), whose sum is σ = 31196880. Its totient is φ = 9821952.

The previous prime is 20218333. The next prime is 20218343. The reversal of 20218342 is 24381202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20218343) 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 7 ways as a sum of consecutive naturals, for example, 19534 + ... + 20542.

It is an arithmetic number, because the mean of its divisors is an integer number (1949805).

Almost surely, 2^20218342 is an apocalyptic number.

20218342 is a deficient number, since it is larger than the sum of its proper divisors (10978538).

20218342 is a wasteful number, since it uses less digits than its factorization.

20218342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1287.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 20218342 is about 4496.4810685691. The cubic root of 20218342 is about 272.4259743374.

Adding to 20218342 its reverse (24381202), we get a palindrome (44599544).

The spelling of 20218342 in words is "twenty million, two hundred eighteen thousand, three hundred forty-two".