220021616 has 40 divisors (see below), whose sum is σ = 457765344. Its totient is φ = 102072320.

The previous prime is 220021567. The next prime is 220021631. The reversal of 220021616 is 616120022.

It is a happy number.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 13616 + ... + 25008.

Almost surely, 2^220021616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 220021616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (228882672).

220021616 is an abundant number, since it is smaller than the sum of its proper divisors (237743728).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

220021616 is a wasteful number, since it uses less digits than its factorization.

220021616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11489 (or 11483 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 220021616 is about 14833.1256315046. The cubic root of 220021616 is about 603.7008445021.

Adding to 220021616 its reverse (616120022), we get a palindrome (836141638).

The spelling of 220021616 in words is "two hundred twenty million, twenty-one thousand, six hundred sixteen".