20216242 has 4 divisors (see below), whose sum is σ = 30324366. Its totient is φ = 10108120.

The previous prime is 20216237. The next prime is 20216243. The reversal of 20216242 is 24261202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17816841 + 2399401 = 4221^2 + 1549^2 .

It is not an unprimeable number, because it can be changed into a prime (20216243) 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 as a sum of consecutive naturals, namely, 5054059 + ... + 5054062.

Almost surely, 2^20216242 is an apocalyptic number.

20216242 is a deficient number, since it is larger than the sum of its proper divisors (10108124).

20216242 is a wasteful number, since it uses less digits than its factorization.

20216242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10108123.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 20216242 is about 4496.2475465659. The cubic root of 20216242 is about 272.4165420711.

Adding to 20216242 its reverse (24261202), we get a palindrome (44477444).

The spelling of 20216242 in words is "twenty million, two hundred sixteen thousand, two hundred forty-two".