220021604 has 12 divisors (see below), whose sum is σ = 420041328. Its totient is φ = 100009800.

The previous prime is 220021567. The next prime is 220021631. The reversal of 220021604 is 406120022.

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, 2500202 + ... + 2500289.

It is an arithmetic number, because the mean of its divisors is an integer number (35003444).

Almost surely, 2^220021604 is an apocalyptic number.

It is an amenable number.

220021604 is a deficient number, since it is larger than the sum of its proper divisors (200019724).

220021604 is a wasteful number, since it uses less digits than its factorization.

220021604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5000506 (or 5000504 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 220021604 is about 14833.1252270046. The cubic root of 220021604 is about 603.7008335268.

Adding to 220021604 its reverse (406120022), we get a palindrome (626141626).

The spelling of 220021604 in words is "two hundred twenty million, twenty-one thousand, six hundred four".