209980080 has 80 divisors (see below), whose sum is σ = 723272160. Its totient is φ = 55994112.

The previous prime is 209980079. The next prime is 209980093. The reversal of 209980080 is 80089902.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46447 + ... + 50766.

It is an arithmetic number, because the mean of its divisors is an integer number (9040902).

Almost surely, 2^209980080 is an apocalyptic number.

209980080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

209980080 is an abundant number, since it is smaller than the sum of its proper divisors (513292080).

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

209980080 is a wasteful number, since it uses less digits than its factorization.

209980080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97235 (or 97223 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 209980080 is about 14490.6894245926. The cubic root of 209980080 is about 594.3734005669.

The spelling of 209980080 in words is "two hundred nine million, nine hundred eighty thousand, eighty".