20008442 has 8 divisors (see below), whose sum is σ = 30033300. Its totient is φ = 9997344.

The previous prime is 20008381. The next prime is 20008447. The reversal of 20008442 is 24480002.

It can be written as a sum of positive squares in 2 ways, for example, as 19971961 + 36481 = 4469^2 + 191^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20008447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1784 + ... + 6572.

Almost surely, 2^20008442 is an apocalyptic number.

20008442 is a deficient number, since it is larger than the sum of its proper divisors (10024858).

20008442 is a wasteful number, since it uses less digits than its factorization.

20008442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6880.

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 20008442 is about 4473.0796997147. The cubic root of 20008442 is about 271.4799481430.

Adding to 20008442 its reverse (24480002), we get a palindrome (44488444).

The spelling of 20008442 in words is "twenty million, eight thousand, four hundred forty-two".