220709 has 2 divisors, whose sum is σ = 220710. Its totient is φ = 220708.

The previous prime is 220699. The next prime is 220721. The reversal of 220709 is 907022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124609 + 96100 = 353^2 + 310^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220709 is a prime.

It is a Chen prime.

It is a plaindrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110354 + 110355.

It is an arithmetic number, because the mean of its divisors is an integer number (110355).

2²²⁰⁷⁰⁹ is an apocalyptic number.

It is an amenable number.

220709 is a deficient number, since it is larger than the sum of its proper divisors (1).

220709 is an equidigital number, since it uses as much as digits as its factorization.

220709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 220709 is about 469.7967645695. The cubic root of 220709 is about 60.4328878098.

It can be divided in two parts, 220 and 709, that added together give a palindrome (929).

The spelling of 220709 in words is "two hundred twenty thousand, seven hundred nine".