20008500 has 48 divisors (see below), whose sum is σ = 58269120. Its totient is φ = 5335200.

The previous prime is 20008487. The next prime is 20008523. The reversal of 20008500 is 580002.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20008500.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5170 + ... + 8169.

It is an arithmetic number, because the mean of its divisors is an integer number (1213940).

Almost surely, 2^20008500 is an apocalyptic number.

20008500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20008500 is an abundant number, since it is smaller than the sum of its proper divisors (38260620).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20008500 is a wasteful number, since it uses less digits than its factorization.

20008500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13361 (or 13349 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 20008500 is about 4473.0861829390. The cubic root of 20008500 is about 271.4802104627.

Adding to 20008500 its reverse (580002), we get a palindrome (20588502).

The spelling of 20008500 in words is "twenty million, eight thousand, five hundred".