20204242 has 16 divisors (see below), whose sum is σ = 31671000. Its totient is φ = 9654400.

The previous prime is 20204231. The next prime is 20204243. The reversal of 20204242 is 24240202.

It can be written as a sum of positive squares in 4 ways, for example, as 16475481 + 3728761 = 4059^2 + 1931^2 .

It is a super-2 number, since 2×20204242² = 816422789589128, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20204243) 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, 4134 + ... + 7582.

Almost surely, 2^20204242 is an apocalyptic number.

20204242 is a deficient number, since it is larger than the sum of its proper divisors (11466758).

20204242 is a wasteful number, since it uses less digits than its factorization.

20204242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3581.

The product of its (nonzero) digits is 256, while the sum is 16.

The square root of 20204242 is about 4494.9129023820. The cubic root of 20204242 is about 272.3626308723.

Adding to 20204242 its reverse (24240202), we get a palindrome (44444444).

The spelling of 20204242 in words is "twenty million, two hundred four thousand, two hundred forty-two".