220742215 has 4 divisors (see below), whose sum is σ = 264890664. Its totient is φ = 176593768.

The previous prime is 220742213. The next prime is 220742231. The reversal of 220742215 is 512247022.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 220742215 - 2¹ = 220742213 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 220742215.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220742213) 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, 22074217 + ... + 22074226.

It is an arithmetic number, because the mean of its divisors is an integer number (66222666).

Almost surely, 2^220742215 is an apocalyptic number.

220742215 is a deficient number, since it is larger than the sum of its proper divisors (44148449).

220742215 is an equidigital number, since it uses as much as digits as its factorization.

220742215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44148448.

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 220742215 is about 14857.3959696846. The cubic root of 220742215 is about 604.3591921875.

Adding to 220742215 its reverse (512247022), we get a palindrome (732989237).

The spelling of 220742215 in words is "two hundred twenty million, seven hundred forty-two thousand, two hundred fifteen".