215155220 has 24 divisors (see below), whose sum is σ = 516372864. Its totient is φ = 73767456.

The previous prime is 215155207. The next prime is 215155253. The reversal of 215155220 is 22551512.

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, 768272 + ... + 768551.

It is an arithmetic number, because the mean of its divisors is an integer number (21515536).

Almost surely, 2^215155220 is an apocalyptic number.

215155220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215155220 is an abundant number, since it is smaller than the sum of its proper divisors (301217644).

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

215155220 is a wasteful number, since it uses less digits than its factorization.

215155220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1536839 (or 1536837 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 215155220 is about 14668.1703017111. The cubic root of 215155220 is about 599.2167743371.

The spelling of 215155220 in words is "two hundred fifteen million, one hundred fifty-five thousand, two hundred twenty".