220641 has 4 divisors (see below), whose sum is σ = 294192. Its totient is φ = 147092.

The previous prime is 220613. The next prime is 220663. The reversal of 220641 is 146022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 220641 - 2⁷ = 220513 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 220641.

It is not an unprimeable number, because it can be changed into a prime (220681) 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 3 ways as a sum of consecutive naturals, for example, 36771 + ... + 36776.

It is an arithmetic number, because the mean of its divisors is an integer number (73548).

2²²⁰⁶⁴¹ is an apocalyptic number.

It is an amenable number.

220641 is a deficient number, since it is larger than the sum of its proper divisors (73551).

220641 is an equidigital number, since it uses as much as digits as its factorization.

220641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73550.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 220641 is about 469.7243872741. The cubic root of 220641 is about 60.4266807552.

Adding to 220641 its reverse (146022), we get a palindrome (366663).

It can be divided in two parts, 220 and 641, that added together give a triangular number (861 = T₄₁).

The spelling of 220641 in words is "two hundred twenty thousand, six hundred forty-one".