220620321 has 16 divisors (see below), whose sum is σ = 327316800. Its totient is φ = 146867904.

The previous prime is 220620319. The next prime is 220620431. The reversal of 220620321 is 123026022.

220620321 is a `hidden beast` number, since 2 + 20 + 620 + 3 + 21 = 666.

It is not a de Polignac number, because 220620321 - 2¹ = 220620319 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 220620294 and 220620303.

It is not an unprimeable number, because it can be changed into a prime (220620121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14425 + ... + 25481.

It is an arithmetic number, because the mean of its divisors is an integer number (20457300).

Almost surely, 2^220620321 is an apocalyptic number.

It is an amenable number.

220620321 is a deficient number, since it is larger than the sum of its proper divisors (106696479).

220620321 is a wasteful number, since it uses less digits than its factorization.

220620321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11805 (or 11799 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 220620321 is about 14853.2932711907. The cubic root of 220620321 is about 604.2479291873.

Adding to 220620321 its reverse (123026022), we get a palindrome (343646343).

The spelling of 220620321 in words is "two hundred twenty million, six hundred twenty thousand, three hundred twenty-one".