206909980 has 48 divisors (see below), whose sum is σ = 454164480. Its totient is φ = 79103808.

The previous prime is 206909971. The next prime is 206909993. The reversal of 206909980 is 89909602.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a congruent number.

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, 37861 + ... + 42979.

It is an arithmetic number, because the mean of its divisors is an integer number (9461760).

Almost surely, 2^206909980 is an apocalyptic number.

206909980 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 206909980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (227082240).

206909980 is an abundant number, since it is smaller than the sum of its proper divisors (247254500).

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

206909980 is a wasteful number, since it uses less digits than its factorization.

206909980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5218 (or 5216 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 206909980 is about 14384.3658184850. The cubic root of 206909980 is about 591.4624068664.

The spelling of 206909980 in words is "two hundred six million, nine hundred nine thousand, nine hundred eighty".