220207745 has 4 divisors (see below), whose sum is σ = 264249300. Its totient is φ = 176166192.

The previous prime is 220207699. The next prime is 220207747. The reversal of 220207745 is 547702022.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 91317136 + 128890609 = 9556^2 + 11353^2 .

It is a cyclic number.

It is not a de Polignac number, because 220207745 - 2⁸ = 220207489 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (220207747) 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, 22020770 + ... + 22020779.

It is an arithmetic number, because the mean of its divisors is an integer number (66062325).

Almost surely, 2^220207745 is an apocalyptic number.

It is an amenable number.

220207745 is a deficient number, since it is larger than the sum of its proper divisors (44041555).

220207745 is an equidigital number, since it uses as much as digits as its factorization.

220207745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44041554.

The product of its (nonzero) digits is 7840, while the sum is 29.

The square root of 220207745 is about 14839.3984042481. The cubic root of 220207745 is about 603.8710316648.

Adding to 220207745 its reverse (547702022), we get a palindrome (767909767).

The spelling of 220207745 in words is "two hundred twenty million, two hundred seven thousand, seven hundred forty-five".