206812780 has 48 divisors (see below), whose sum is σ = 467841024. Its totient is φ = 76570560.

The previous prime is 206812763. The next prime is 206812789. The reversal of 206812780 is 87218602.

It is not an unprimeable number, because it can be changed into a prime (206812789) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7009 + ... + 21511.

It is an arithmetic number, because the mean of its divisors is an integer number (9746688).

Almost surely, 2^206812780 is an apocalyptic number.

206812780 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 206812780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (233920512).

206812780 is an abundant number, since it is smaller than the sum of its proper divisors (261028244).

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

206812780 is a wasteful number, since it uses less digits than its factorization.

206812780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14566 (or 14564 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 206812780 is about 14380.9867533490. The cubic root of 206812780 is about 591.3697753579.

The spelling of 206812780 in words is "two hundred six million, eight hundred twelve thousand, seven hundred eighty".