220028240 has 20 divisors (see below), whose sum is σ = 511565844. Its totient is φ = 88011264.

The previous prime is 220028231. The next prime is 220028251. The reversal of 220028240 is 42820022.

220028240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 24364096 + 195664144 = 4936^2 + 13988^2 .

It is a tau number, because it is divible by the number of its divisors (20).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1375097 + ... + 1375256.

Almost surely, 2^220028240 is an apocalyptic number.

220028240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

220028240 is an abundant number, since it is smaller than the sum of its proper divisors (291537604).

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

220028240 is a wasteful number, since it uses less digits than its factorization.

220028240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2750366 (or 2750360 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 220028240 is about 14833.3489138495. The cubic root of 220028240 is about 603.7069028072.

Adding to 220028240 its reverse (42820022), we get a palindrome (262848262).

The spelling of 220028240 in words is "two hundred twenty million, twenty-eight thousand, two hundred forty".