20004900 has 36 divisors (see below), whose sum is σ = 57881712. Its totient is φ = 5334560.

The previous prime is 20004893. The next prime is 20004923. The reversal of 20004900 is 940002.

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 20004900.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33042 + ... + 33641.

Almost surely, 2^20004900 is an apocalyptic number.

20004900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20004900 is an abundant number, since it is smaller than the sum of its proper divisors (37876812).

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

20004900 is a wasteful number, since it uses less digits than its factorization.

20004900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66700 (or 66693 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 20004900 is about 4472.6837581032. The cubic root of 20004900 is about 271.4639275932.

Adding to 20004900 its reverse (940002), we get a palindrome (20944902).

The spelling of 20004900 in words is "twenty million, four thousand, nine hundred".