206551380 has 48 divisors (see below), whose sum is σ = 660965760. Its totient is φ = 47211648.

The previous prime is 206551379. The next prime is 206551439. The reversal of 206551380 is 83155602.

206551380 is digitally balanced in base 3 and base 9, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

206551380 is strictly pandigital in base 9.

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, 245475 + ... + 246314.

It is an arithmetic number, because the mean of its divisors is an integer number (13770120).

Almost surely, 2^206551380 is an apocalyptic number.

206551380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206551380 is an abundant number, since it is smaller than the sum of its proper divisors (454414380).

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

206551380 is a wasteful number, since it uses less digits than its factorization.

206551380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491808 (or 491806 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 206551380 is about 14371.8954908530. The cubic root of 206551380 is about 591.1205173356.

The spelling of 206551380 in words is "two hundred six million, five hundred fifty-one thousand, three hundred eighty".