20442506 has 24 divisors (see below), whose sum is σ = 36905220. Its totient is φ = 8457792.

The previous prime is 20442479. The next prime is 20442511. The reversal of 20442506 is 60524402.

It can be written as a sum of positive squares in 2 ways, for example, as 19140625 + 1301881 = 4375^2 + 1141^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 755 + ... + 6438.

Almost surely, 2^20442506 is an apocalyptic number.

20442506 is a deficient number, since it is larger than the sum of its proper divisors (16462714).

20442506 is a wasteful number, since it uses less digits than its factorization.

20442506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7238 (or 7231 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 20442506 is about 4521.3389609716. The cubic root of 20442506 is about 273.4290863544.

Adding to 20442506 its reverse (60524402), we get a palindrome (80966908).

The spelling of 20442506 in words is "twenty million, four hundred forty-two thousand, five hundred six".