320860820 has 36 divisors (see below), whose sum is σ = 783819540. Its totient is φ = 110009088.

The previous prime is 320860699. The next prime is 320860823. The reversal of 320860820 is 28068023.

It can be written as a sum of positive squares in 2 ways, for example, as 249829636 + 71031184 = 15806^2 + 8428^2 .

It is a super-2 number, since 2×320860820² = 205903331622144800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320860823) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 162725 + ... + 164684.

It is an arithmetic number, because the mean of its divisors is an integer number (21772765).

Almost surely, 2^320860820 is an apocalyptic number.

It is an amenable number.

320860820 is an abundant number, since it is smaller than the sum of its proper divisors (462958720).

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

320860820 is a wasteful number, since it uses less digits than its factorization.

320860820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327432 (or 327423 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 320860820 is about 17912.5883110175. The cubic root of 320860820 is about 684.6031551524.

The spelling of 320860820 in words is "three hundred twenty million, eight hundred sixty thousand, eight hundred twenty".