208429820 has 12 divisors (see below), whose sum is σ = 437702664. Its totient is φ = 83371920.

The previous prime is 208429807. The next prime is 208429847. The reversal of 208429820 is 28924802.

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, 5210726 + ... + 5210765.

It is an arithmetic number, because the mean of its divisors is an integer number (36475222).

Almost surely, 2^208429820 is an apocalyptic number.

208429820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

208429820 is an abundant number, since it is smaller than the sum of its proper divisors (229272844).

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

208429820 is a wasteful number, since it uses less digits than its factorization.

208429820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10421500 (or 10421498 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 208429820 is about 14437.0987390126. The cubic root of 208429820 is about 592.9070546978.

The spelling of 208429820 in words is "two hundred eight million, four hundred twenty-nine thousand, eight hundred twenty".