208171420 has 12 divisors (see below), whose sum is σ = 437160024. Its totient is φ = 83268560.

The previous prime is 208171373. The next prime is 208171423. The reversal of 208171420 is 24171802.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208171423) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 5204266 + ... + 5204305.

It is an arithmetic number, because the mean of its divisors is an integer number (36430002).

Almost surely, 2^208171420 is an apocalyptic number.

208171420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

208171420 is an abundant number, since it is smaller than the sum of its proper divisors (228988604).

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

208171420 is a wasteful number, since it uses less digits than its factorization.

208171420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10408580 (or 10408578 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 208171420 is about 14428.1467971462. The cubic root of 208171420 is about 592.6619353587.

The spelling of 208171420 in words is "two hundred eight million, one hundred seventy-one thousand, four hundred twenty".