220740640 has 24 divisors (see below), whose sum is σ = 521500140. Its totient is φ = 88296192.

The previous prime is 220740607. The next prime is 220740643. The reversal of 220740640 is 46047022.

It can be written as a sum of positive squares in 2 ways, for example, as 213276816 + 7463824 = 14604^2 + 2732^2 .

It is not an unprimeable number, because it can be changed into a prime (220740643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 689655 + ... + 689974.

Almost surely, 2^220740640 is an apocalyptic number.

220740640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

220740640 is an abundant number, since it is smaller than the sum of its proper divisors (300759500).

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

220740640 is a wasteful number, since it uses less digits than its factorization.

220740640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1379644 (or 1379636 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 220740640 is about 14857.3429656854. The cubic root of 220740640 is about 604.3577548125.

Adding to 220740640 its reverse (46047022), we get a palindrome (266787662).

The spelling of 220740640 in words is "two hundred twenty million, seven hundred forty thousand, six hundred forty".