209204020 has 24 divisors (see below), whose sum is σ = 439778304. Its totient is φ = 83595936.

The previous prime is 209204011. The next prime is 209204053. The reversal of 209204020 is 20402902.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 16929 + ... + 26551.

It is an arithmetic number, because the mean of its divisors is an integer number (18324096).

Almost surely, 2^209204020 is an apocalyptic number.

209204020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

209204020 is an abundant number, since it is smaller than the sum of its proper divisors (230574284).

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

209204020 is a wasteful number, since it uses less digits than its factorization.

209204020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10719 (or 10717 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 209204020 is about 14463.8867528752. The cubic root of 209204020 is about 593.6402534742.

Adding to 209204020 its reverse (20402902), we get a palindrome (229606922).

The spelling of 209204020 in words is "two hundred nine million, two hundred four thousand, twenty".