206320780 has 24 divisors (see below), whose sum is σ = 437567760. Its totient is φ = 81710400.

The previous prime is 206320757. The next prime is 206320799. The reversal of 206320780 is 87023602.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 49050 + ... + 53089.

It is an arithmetic number, because the mean of its divisors is an integer number (18231990).

Almost surely, 2^206320780 is an apocalyptic number.

206320780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206320780 is an abundant number, since it is smaller than the sum of its proper divisors (231246980).

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

206320780 is a wasteful number, since it uses less digits than its factorization.

206320780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102249 (or 102247 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 206320780 is about 14363.8706482619. The cubic root of 206320780 is about 590.9004540104.

The spelling of 206320780 in words is "two hundred six million, three hundred twenty thousand, seven hundred eighty".