220724309 has 12 divisors (see below), whose sum is σ = 246724992. Its totient is φ = 197168400.

The previous prime is 220724297. The next prime is 220724321. The reversal of 220724309 is 903427022.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (220724297) and next prime (220724321).

It is not a de Polignac number, because 220724309 - 2¹⁶ = 220658773 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220724809) 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 11 ways as a sum of consecutive naturals, for example, 15827 + ... + 26304.

It is an arithmetic number, because the mean of its divisors is an integer number (20560416).

Almost surely, 2^220724309 is an apocalyptic number.

It is an amenable number.

220724309 is a deficient number, since it is larger than the sum of its proper divisors (26000683).

220724309 is a wasteful number, since it uses less digits than its factorization.

220724309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42188 (or 42175 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 220724309 is about 14856.7933619607. The cubic root of 220724309 is about 604.3428504283.

The spelling of 220724309 in words is "two hundred twenty million, seven hundred twenty-four thousand, three hundred nine".