220905636 has 24 divisors (see below), whose sum is σ = 589081920. Its totient is φ = 63115872.

The previous prime is 220905589. The next prime is 220905653. The reversal of 220905636 is 636509022.

It is a junction number, because it is equal to n+sod(n) for n = 220905597 and 220905606.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1314831 + ... + 1314998.

It is an arithmetic number, because the mean of its divisors is an integer number (24545080).

Almost surely, 2^220905636 is an apocalyptic number.

It is an amenable number.

220905636 is an abundant number, since it is smaller than the sum of its proper divisors (368176284).

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

220905636 is a wasteful number, since it uses less digits than its factorization.

220905636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2629843 (or 2629841 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 33.

The square root of 220905636 is about 14862.8946036766. The cubic root of 220905636 is about 604.5082961560.

The spelling of 220905636 in words is "two hundred twenty million, nine hundred five thousand, six hundred thirty-six".