209020231680 has 448 divisors, whose sum is σ = 751720193280. Its totient is φ = 49205477376.

The previous prime is 209020231661. The next prime is 209020231697. The reversal of 209020231680 is 86132020902.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36738276 + ... + 36743964.

It is an arithmetic number, because the mean of its divisors is an integer number (1677946860).

Almost surely, 2^209020231680 is an apocalyptic number.

209020231680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 209020231680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (375860096640).

209020231680 is an abundant number, since it is smaller than the sum of its proper divisors (542699961600).

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

209020231680 is a wasteful number, since it uses less digits than its factorization.

209020231680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5759 (or 5735 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The spelling of 209020231680 in words is "two hundred nine billion, twenty million, two hundred thirty-one thousand, six hundred eighty".