206906780 has 24 divisors (see below), whose sum is σ = 440627040. Its totient is φ = 81596480.

The previous prime is 206906773. The next prime is 206906807. The reversal of 206906780 is 87609602.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71435 + ... + 74274.

It is an arithmetic number, because the mean of its divisors is an integer number (18359460).

Almost surely, 2^206906780 is an apocalyptic number.

206906780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206906780 is an abundant number, since it is smaller than the sum of its proper divisors (233720260).

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

206906780 is a wasteful number, since it uses less digits than its factorization.

206906780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145789 (or 145787 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 206906780 is about 14384.2545861786. The cubic root of 206906780 is about 591.4593577312.

The spelling of 206906780 in words is "two hundred six million, nine hundred six thousand, seven hundred eighty".