220511240 has 16 divisors (see below), whose sum is σ = 496150380. Its totient is φ = 88204480.

The previous prime is 220511197. The next prime is 220511297. The reversal of 220511240 is 42115022.

It can be written as a sum of positive squares in 2 ways, for example, as 181548676 + 38962564 = 13474^2 + 6242^2 .

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 3 ways as a sum of consecutive naturals, for example, 2756351 + ... + 2756430.

Almost surely, 2^220511240 is an apocalyptic number.

220511240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

220511240 is an abundant number, since it is smaller than the sum of its proper divisors (275639140).

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

220511240 is a wasteful number, since it uses less digits than its factorization.

220511240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5512792 (or 5512788 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 220511240 is about 14849.6208705812. The cubic root of 220511240 is about 604.1483269476.

Adding to 220511240 its reverse (42115022), we get a palindrome (262626262).

The spelling of 220511240 in words is "two hundred twenty million, five hundred eleven thousand, two hundred forty".