220742 has 16 divisors (see below), whose sum is σ = 360240. Its totient is φ = 101088.

The previous prime is 220721. The next prime is 220747. The reversal of 220742 is 247022.

It is a self number, because there is not a number n which added to its sum of digits gives 220742.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220747) by changing a digit.

220742 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1328 + ... + 1484.

It is an arithmetic number, because the mean of its divisors is an integer number (22515).

2²²⁰⁷⁴² is an apocalyptic number.

220742 is a deficient number, since it is larger than the sum of its proper divisors (139498).

220742 is a wasteful number, since it uses less digits than its factorization.

220742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215.

The product of its (nonzero) digits is 224, while the sum is 17.

The square root of 220742 is about 469.8318848269. The cubic root of 220742 is about 60.4358995975.

Adding to 220742 its reverse (247022), we get a palindrome (467764).

The spelling of 220742 in words is "two hundred twenty thousand, seven hundred forty-two", and thus it is an iban number.