20008507 has 12 divisors (see below), whose sum is σ = 21644280. Its totient is φ = 18432128.

The previous prime is 20008487. The next prime is 20008523. The reversal of 20008507 is 70580002.

It is a de Polignac number, because none of the positive numbers 2^k-20008507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20008207) 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 11 ways as a sum of consecutive naturals, for example, 47544 + ... + 47962.

It is an arithmetic number, because the mean of its divisors is an integer number (1803690).

Almost surely, 2^20008507 is an apocalyptic number.

20008507 is a deficient number, since it is larger than the sum of its proper divisors (1635773).

20008507 is an equidigital number, since it uses as much as digits as its factorization.

20008507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542 (or 489 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 20008507 is about 4473.0869653965. The cubic root of 20008507 is about 271.4802421219.

Adding to 20008507 its reverse (70580002), we get a palindrome (90588509).

The spelling of 20008507 in words is "twenty million, eight thousand, five hundred seven".