220240645 has 8 divisors (see below), whose sum is σ = 273402360. Its totient is φ = 170116800.

The previous prime is 220240607. The next prime is 220240649. The reversal of 220240645 is 546042022.

It can be written as a sum of positive squares in 4 ways, for example, as 36204289 + 184036356 = 6017^2 + 13566^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 220240645 - 2¹⁵ = 220207877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220240649) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 759306 + ... + 759595.

It is an arithmetic number, because the mean of its divisors is an integer number (34175295).

Almost surely, 2^220240645 is an apocalyptic number.

It is an amenable number.

220240645 is a deficient number, since it is larger than the sum of its proper divisors (53161715).

220240645 is a wasteful number, since it uses less digits than its factorization.

220240645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1518935.

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 220240645 is about 14840.5068983509. The cubic root of 220240645 is about 603.9011038247.

Adding to 220240645 its reverse (546042022), we get a palindrome (766282667).

The spelling of 220240645 in words is "two hundred twenty million, two hundred forty thousand, six hundred forty-five".