206778620 has 12 divisors (see below), whose sum is σ = 434235144. Its totient is φ = 82711440.

The previous prime is 206778619. The next prime is 206778631. The reversal of 206778620 is 26877602.

206778620 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5169446 + ... + 5169485.

It is an arithmetic number, because the mean of its divisors is an integer number (36186262).

Almost surely, 2^206778620 is an apocalyptic number.

206778620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206778620 is an abundant number, since it is smaller than the sum of its proper divisors (227456524).

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

206778620 is a wasteful number, since it uses less digits than its factorization.

206778620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10338940 (or 10338938 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 38.

The square root of 206778620 is about 14379.7990250212. The cubic root of 206778620 is about 591.3372140177.

The spelling of 206778620 in words is "two hundred six million, seven hundred seventy-eight thousand, six hundred twenty".