20424242 has 16 divisors (see below), whose sum is σ = 32528952. Its totient is φ = 9584640.

The previous prime is 20424199. The next prime is 20424247. The reversal of 20424242 is 24242402.

It can be written as a sum of positive squares in 4 ways, for example, as 19616041 + 808201 = 4429^2 + 899^2 .

It is a super-2 number, since 2×20424242² = 834299322549128, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20424247) 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 in 7 ways as a sum of consecutive naturals, for example, 17138 + ... + 18290.

Almost surely, 2^20424242 is an apocalyptic number.

20424242 is a deficient number, since it is larger than the sum of its proper divisors (12104710).

20424242 is a wasteful number, since it uses less digits than its factorization.

20424242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1693.

The product of its (nonzero) digits is 1024, while the sum is 20.

The square root of 20424242 is about 4519.3187539717. The cubic root of 20424242 is about 273.3476319442.

Adding to 20424242 its reverse (24242402), we get a palindrome (44666644).

The spelling of 20424242 in words is "twenty million, four hundred twenty-four thousand, two hundred forty-two".