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206780 = 22572211
BaseRepresentation
bin110010011110111100
3101111122112
4302132330
523104110
64233152
71520600
oct623674
9344575
10206780
111313a2
129b7b8
1373172
1455500
1541405
hex327bc

206780 has 36 divisors (see below), whose sum is σ = 507528. Its totient is φ = 70560.

The previous prime is 206779. The next prime is 206783. The reversal of 206780 is 87602.

It is a nialpdrome in base 14.

It is a zygodrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 875 + ... + 1085.

It is an arithmetic number, because the mean of its divisors is an integer number (14098).

2206780 is an apocalyptic number.

206780 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 206780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (253764).

206780 is an abundant number, since it is smaller than the sum of its proper divisors (300748).

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

206780 is a wasteful number, since it uses less digits than its factorization.

206780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234 (or 225 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 206780 is about 454.7306895295. The cubic root of 206780 is about 59.1338529504.

The spelling of 206780 in words is "two hundred six thousand, seven hundred eighty".

Divisors: 1 2 4 5 7 10 14 20 28 35 49 70 98 140 196 211 245 422 490 844 980 1055 1477 2110 2954 4220 5908 7385 10339 14770 20678 29540 41356 51695 103390 206780