320420140 has 24 divisors (see below), whose sum is σ = 673222032. Its totient is φ = 128103360.

The previous prime is 320420119. The next prime is 320420143. The reversal of 320420140 is 41024023.

It is a super-2 number, since 2×320420140² = 205338132235239200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (320420143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67030 + ... + 71650.

It is an arithmetic number, because the mean of its divisors is an integer number (28050918).

Almost surely, 2^320420140 is an apocalyptic number.

It is an amenable number.

320420140 is an abundant number, since it is smaller than the sum of its proper divisors (352801892).

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

320420140 is a wasteful number, since it uses less digits than its factorization.

320420140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8097 (or 8095 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 320420140 is about 17900.2832379826. The cubic root of 320420140 is about 684.2895932981.

Adding to 320420140 its reverse (41024023), we get a palindrome (361444163).

The spelling of 320420140 in words is "three hundred twenty million, four hundred twenty thousand, one hundred forty".