215450220 has 24 divisors (see below), whose sum is σ = 603260784. Its totient is φ = 57453376.

The previous prime is 215450189. The next prime is 215450237. The reversal of 215450220 is 22054512.

It is a happy number.

215450220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 1795359 + ... + 1795478.

It is an arithmetic number, because the mean of its divisors is an integer number (25135866).

Almost surely, 2^215450220 is an apocalyptic number.

215450220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215450220 is an abundant number, since it is smaller than the sum of its proper divisors (387810564).

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

215450220 is a wasteful number, since it uses less digits than its factorization.

215450220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3590849 (or 3590847 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 215450220 is about 14678.2226444485. Note that the first 3 decimals coincide. The cubic root of 215450220 is about 599.4905119368.

The spelling of 215450220 in words is "two hundred fifteen million, four hundred fifty thousand, two hundred twenty".