215800220 has 24 divisors (see below), whose sum is σ = 464235408. Its totient is φ = 84214400.

The previous prime is 215800219. The next prime is 215800231. The reversal of 215800220 is 22008512.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 215800192 and 215800201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130766 + ... + 132405.

It is an arithmetic number, because the mean of its divisors is an integer number (19343142).

Almost surely, 2^215800220 is an apocalyptic number.

215800220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215800220 is an abundant number, since it is smaller than the sum of its proper divisors (248435188).

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

215800220 is a wasteful number, since it uses less digits than its factorization.

215800220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263221 (or 263219 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 215800220 is about 14690.1402307806. The cubic root of 215800220 is about 599.8149614589.

Adding to 215800220 its reverse (22008512), we get a palindrome (237808732).

The spelling of 215800220 in words is "two hundred fifteen million, eight hundred thousand, two hundred twenty".