20008424 has 16 divisors (see below), whose sum is σ = 38030820. Its totient is φ = 9866880.

The previous prime is 20008381. The next prime is 20008447. The reversal of 20008424 is 42480002.

It can be written as a sum of positive squares in 2 ways, for example, as 17056900 + 2951524 = 4130^2 + 1718^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20008396 and 20008405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16547 + ... + 17714.

Almost surely, 2^20008424 is an apocalyptic number.

It is an amenable number.

20008424 is a deficient number, since it is larger than the sum of its proper divisors (18022396).

20008424 is a wasteful number, since it uses less digits than its factorization.

20008424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34340 (or 34336 counting only the distinct ones).

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

The square root of 20008424 is about 4473.0776876777. The cubic root of 20008424 is about 271.4798667334.

Adding to 20008424 its reverse (42480002), we get a palindrome (62488426).

The spelling of 20008424 in words is "twenty million, eight thousand, four hundred twenty-four".