209004020 has 12 divisors (see below), whose sum is σ = 438908484. Its totient is φ = 83601600.

The previous prime is 209004011. The next prime is 209004067. The reversal of 209004020 is 20400902.

It can be written as a sum of positive squares in 2 ways, for example, as 111429136 + 97574884 = 10556^2 + 9878^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 209004020.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5225081 + ... + 5225120.

It is an arithmetic number, because the mean of its divisors is an integer number (36575707).

Almost surely, 2^209004020 is an apocalyptic number.

209004020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

209004020 is an abundant number, since it is smaller than the sum of its proper divisors (229904464).

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

209004020 is a wasteful number, since it uses less digits than its factorization.

209004020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10450210 (or 10450208 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 209004020 is about 14456.9713287396. The cubic root of 209004020 is about 593.4510188925.

Adding to 209004020 its reverse (20400902), we get a palindrome (229404922).

The spelling of 209004020 in words is "two hundred nine million, four thousand, twenty".