208400220 has 72 divisors (see below), whose sum is σ = 722458464. Its totient is φ = 47634048.

The previous prime is 208400201. The next prime is 208400221. The reversal of 208400220 is 22004802.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 208400193 and 208400202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208400221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 81439 + ... + 83958.

Almost surely, 2^208400220 is an apocalyptic number.

208400220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

208400220 is an abundant number, since it is smaller than the sum of its proper divisors (514058244).

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

208400220 is a wasteful number, since it uses less digits than its factorization.

208400220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165419 (or 165414 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 208400220 is about 14436.0735658973. The cubic root of 208400220 is about 592.8789862899.

The spelling of 208400220 in words is "two hundred eight million, four hundred thousand, two hundred twenty".