220221020 has 24 divisors (see below), whose sum is σ = 486805200. Its totient is φ = 83452032.

The previous prime is 220221019. The next prime is 220221031. The reversal of 220221020 is 20122022.

It is a junction number, because it is equal to n+sod(n) for n = 220220992 and 220221010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 289385 + ... + 290144.

It is an arithmetic number, because the mean of its divisors is an integer number (20283550).

Almost surely, 2^220221020 is an apocalyptic number.

220221020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

220221020 is an abundant number, since it is smaller than the sum of its proper divisors (266584180).

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

220221020 is a wasteful number, since it uses less digits than its factorization.

220221020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 579557 (or 579555 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 220221020 is about 14839.8456865292. The cubic root of 220221020 is about 603.8831660047.

Adding to 220221020 its reverse (20122022), we get a palindrome (240343042).

The spelling of 220221020 in words is "two hundred twenty million, two hundred twenty-one thousand, twenty".