209051420 has 24 divisors (see below), whose sum is σ = 439707744. Its totient is φ = 83487296.

The previous prime is 209051419. The next prime is 209051461. The reversal of 209051420 is 24150902.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5057 + ... + 21063.

It is an arithmetic number, because the mean of its divisors is an integer number (18321156).

Almost surely, 2^209051420 is an apocalyptic number.

209051420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

209051420 is an abundant number, since it is smaller than the sum of its proper divisors (230656324).

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

209051420 is a wasteful number, since it uses less digits than its factorization.

209051420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16669 (or 16667 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 209051420 is about 14458.6105833168. The cubic root of 209051420 is about 593.4958783997.

The spelling of 209051420 in words is "two hundred nine million, fifty-one thousand, four hundred twenty".