20008900 has 36 divisors (see below), whose sum is σ = 45708880. Its totient is φ = 7581600.

The previous prime is 20008871. The next prime is 20008903. The reversal of 20008900 is 980002.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (20008903) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3366 + ... + 7165.

Almost surely, 2^20008900 is an apocalyptic number.

20008900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20008900 is an abundant number, since it is smaller than the sum of its proper divisors (25699980).

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

20008900 is a wasteful number, since it uses less digits than its factorization.

20008900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10564 (or 10557 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 20008900 is about 4473.1308945749. The cubic root of 20008900 is about 271.4820195498.

Adding to 20008900 its reverse (980002), we get a palindrome (20988902).

The spelling of 20008900 in words is "twenty million, eight thousand, nine hundred".