216855020 has 24 divisors (see below), whose sum is σ = 465987984. Its totient is φ = 84724416.

The previous prime is 216855019. The next prime is 216855059. The reversal of 216855020 is 20558612.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125219 + ... + 126938.

It is an arithmetic number, because the mean of its divisors is an integer number (19416166).

Almost surely, 2^216855020 is an apocalyptic number.

216855020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216855020 is an abundant number, since it is smaller than the sum of its proper divisors (249132964).

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

216855020 is a wasteful number, since it uses less digits than its factorization.

216855020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252209 (or 252207 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 216855020 is about 14725.9980986010. The cubic root of 216855020 is about 600.7906428673.

The spelling of 216855020 in words is "two hundred sixteen million, eight hundred fifty-five thousand, twenty".