220645307 has 16 divisors (see below), whose sum is σ = 232129152. Its totient is φ = 209539200.

The previous prime is 220645303. The next prime is 220645331. The reversal of 220645307 is 703546022.

It is a cyclic number.

It is not a de Polignac number, because 220645307 - 2² = 220645303 is a prime.

It is a super-2 number, since 2×220645307² = 97368703002248498, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 220645307.

It is not an unprimeable number, because it can be changed into a prime (220645303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 251153 + ... + 252029.

It is an arithmetic number, because the mean of its divisors is an integer number (14508072).

Almost surely, 2^220645307 is an apocalyptic number.

220645307 is a deficient number, since it is larger than the sum of its proper divisors (11483845).

220645307 is a wasteful number, since it uses less digits than its factorization.

220645307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1078.

The product of its (nonzero) digits is 10080, while the sum is 29.

The square root of 220645307 is about 14854.1343403108. The cubic root of 220645307 is about 604.2707393690.

The spelling of 220645307 in words is "two hundred twenty million, six hundred forty-five thousand, three hundred seven".