209440285220 has 12 divisors (see below), whose sum is σ = 439824599004. Its totient is φ = 83776114080.

The previous prime is 209440285217. The next prime is 209440285259. The reversal of 209440285220 is 22582044902.

It can be written as a sum of positive squares in 2 ways, for example, as 36743522596 + 172696762624 = 191686^2 + 415568^2 .

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, 5236007111 + ... + 5236007150.

It is an arithmetic number, because the mean of its divisors is an integer number (36652049917).

Almost surely, 2^209440285220 is an apocalyptic number.

209440285220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

209440285220 is an abundant number, since it is smaller than the sum of its proper divisors (230384313784).

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

209440285220 is a wasteful number, since it uses less digits than its factorization.

209440285220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10472014270 (or 10472014268 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 38.

The spelling of 209440285220 in words is "two hundred nine billion, four hundred forty million, two hundred eighty-five thousand, two hundred twenty".