220649545 has 16 divisors (see below), whose sum is σ = 290025360. Its totient is φ = 160405504.

The previous prime is 220649543. The next prime is 220649551. The reversal of 220649545 is 545946022.

It can be written as a sum of positive squares in 8 ways, for example, as 97344 + 220552201 = 312^2 + 14851^2 .

It is a cyclic number.

It is not a de Polignac number, because 220649545 - 2¹ = 220649543 is a prime.

It is not an unprimeable number, because it can be changed into a prime (220649543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42292 + ... + 47221.

It is an arithmetic number, because the mean of its divisors is an integer number (18126585).

Almost surely, 2^220649545 is an apocalyptic number.

It is an amenable number.

220649545 is a deficient number, since it is larger than the sum of its proper divisors (69375815).

220649545 is a wasteful number, since it uses less digits than its factorization.

220649545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89564.

The product of its (nonzero) digits is 86400, while the sum is 37.

The square root of 220649545 is about 14854.2769935127. The cubic root of 220649545 is about 604.2746081468.

The spelling of 220649545 in words is "two hundred twenty million, six hundred forty-nine thousand, five hundred forty-five".