220285640 has 32 divisors (see below), whose sum is σ = 503773560. Its totient is φ = 86668800.

The previous prime is 220285627. The next prime is 220285657. The reversal of 220285640 is 46582022.

It can be written as a sum of positive squares in 4 ways, for example, as 119202724 + 101082916 = 10918^2 + 10054^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42701 + ... + 47580.

Almost surely, 2^220285640 is an apocalyptic number.

220285640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

220285640 is an abundant number, since it is smaller than the sum of its proper divisors (283487920).

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

220285640 is a wasteful number, since it uses less digits than its factorization.

220285640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90353 (or 90349 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 29.

The square root of 220285640 is about 14842.0227731937. The cubic root of 220285640 is about 603.9422265399.

The spelling of 220285640 in words is "two hundred twenty million, two hundred eighty-five thousand, six hundred forty".