220420345 has 16 divisors (see below), whose sum is σ = 268416720. Its totient is φ = 173746944.

The previous prime is 220420331. The next prime is 220420357. The reversal of 220420345 is 543024022.

It can be written as a sum of positive squares in 8 ways, for example, as 27321529 + 193098816 = 5227^2 + 13896^2 .

It is a cyclic number.

It is not a de Polignac number, because 220420345 - 2⁵ = 220420313 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106339 + ... + 108391.

It is an arithmetic number, because the mean of its divisors is an integer number (16776045).

Almost surely, 2^220420345 is an apocalyptic number.

It is an amenable number.

220420345 is a deficient number, since it is larger than the sum of its proper divisors (47996375).

220420345 is a wasteful number, since it uses less digits than its factorization.

220420345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2364.

The product of its (nonzero) digits is 1920, while the sum is 22.

The square root of 220420345 is about 14846.5600392818. The cubic root of 220420345 is about 604.0653053155.

Adding to 220420345 its reverse (543024022), we get a palindrome (763444367).

The spelling of 220420345 in words is "two hundred twenty million, four hundred twenty thousand, three hundred forty-five".