220815842 has 8 divisors (see below), whose sum is σ = 356702556. Its totient is φ = 101914992.

The previous prime is 220815811. The next prime is 220815857. The reversal of 220815842 is 248518022.

It can be written as a sum of positive squares in 2 ways, for example, as 213422881 + 7392961 = 14609^2 + 2719^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 220815799 and 220815808.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4246433 + ... + 4246484.

Almost surely, 2^220815842 is an apocalyptic number.

220815842 is a deficient number, since it is larger than the sum of its proper divisors (135886714).

220815842 is a wasteful number, since it uses less digits than its factorization.

220815842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8492932.

The product of its (nonzero) digits is 10240, while the sum is 32.

The square root of 220815842 is about 14859.8735526249. The cubic root of 220815842 is about 604.4263779588.

The spelling of 220815842 in words is "two hundred twenty million, eight hundred fifteen thousand, eight hundred forty-two".