206664420 has 24 divisors (see below), whose sum is σ = 578660544. Its totient is φ = 55110496.

The previous prime is 206664413. The next prime is 206664431. The reversal of 206664420 is 24466602.

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

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, 1722144 + ... + 1722263.

It is an arithmetic number, because the mean of its divisors is an integer number (24110856).

Almost surely, 2^206664420 is an apocalyptic number.

206664420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206664420 is an abundant number, since it is smaller than the sum of its proper divisors (371996124).

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

206664420 is a wasteful number, since it uses less digits than its factorization.

206664420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3444419 (or 3444417 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 206664420 is about 14375.8276283489. The cubic root of 206664420 is about 591.2283324424.

The spelling of 206664420 in words is "two hundred six million, six hundred sixty-four thousand, four hundred twenty".