320220356 has 6 divisors (see below), whose sum is σ = 560385630. Its totient is φ = 160110176.

The previous prime is 320220343. The next prime is 320220371. The reversal of 320220356 is 653022023.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 227406400 + 92813956 = 15080^2 + 9634^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40027541 + ... + 40027548.

It is an arithmetic number, because the mean of its divisors is an integer number (93397605).

Almost surely, 2^320220356 is an apocalyptic number.

It is an amenable number.

320220356 is a deficient number, since it is larger than the sum of its proper divisors (240165274).

320220356 is a wasteful number, since it uses less digits than its factorization.

320220356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80055093 (or 80055091 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 23.

The square root of 320220356 is about 17894.7018974891. The cubic root of 320220356 is about 684.1473440883.

Adding to 320220356 its reverse (653022023), we get a palindrome (973242379).

The spelling of 320220356 in words is "three hundred twenty million, two hundred twenty thousand, three hundred fifty-six".