208689420 has 24 divisors (see below), whose sum is σ = 584330544. Its totient is φ = 55650496.

The previous prime is 208689413. The next prime is 208689463. The reversal of 208689420 is 24986802.

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, 1739019 + ... + 1739138.

It is an arithmetic number, because the mean of its divisors is an integer number (24347106).

Almost surely, 2^208689420 is an apocalyptic number.

208689420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

208689420 is an abundant number, since it is smaller than the sum of its proper divisors (375641124).

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

208689420 is a wasteful number, since it uses less digits than its factorization.

208689420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3478169 (or 3478167 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 39.

The square root of 208689420 is about 14446.0866673297. The cubic root of 208689420 is about 593.1531084431.

The spelling of 208689420 in words is "two hundred eight million, six hundred eighty-nine thousand, four hundred twenty".