216736220 has 12 divisors (see below), whose sum is σ = 455146104. Its totient is φ = 86694480.

The previous prime is 216736217. The next prime is 216736229. The reversal of 216736220 is 22637612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216736229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5418386 + ... + 5418425.

It is an arithmetic number, because the mean of its divisors is an integer number (37928842).

Almost surely, 2^216736220 is an apocalyptic number.

216736220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216736220 is an abundant number, since it is smaller than the sum of its proper divisors (238409884).

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

216736220 is a wasteful number, since it uses less digits than its factorization.

216736220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10836820 (or 10836818 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 216736220 is about 14721.9638635611. The cubic root of 216736220 is about 600.6809121573.

The spelling of 216736220 in words is "two hundred sixteen million, seven hundred thirty-six thousand, two hundred twenty".