220540520 has 16 divisors (see below), whose sum is σ = 496216260. Its totient is φ = 88216192.

The previous prime is 220540501. The next prime is 220540531. The reversal of 220540520 is 25045022.

It can be written as a sum of positive squares in 2 ways, for example, as 201583204 + 18957316 = 14198^2 + 4354^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 220540492 and 220540501.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2756717 + ... + 2756796.

Almost surely, 2^220540520 is an apocalyptic number.

220540520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

220540520 is an abundant number, since it is smaller than the sum of its proper divisors (275675740).

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

220540520 is a wasteful number, since it uses less digits than its factorization.

220540520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5513524 (or 5513520 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 20.

The square root of 220540520 is about 14850.6067216124. The cubic root of 220540520 is about 604.1750658417.

Adding to 220540520 its reverse (25045022), we get a palindrome (245585542).

The spelling of 220540520 in words is "two hundred twenty million, five hundred forty thousand, five hundred twenty".