320400131420 has 24 divisors (see below), whose sum is σ = 673088578848. Its totient is φ = 128112756800.

The previous prime is 320400131417. The next prime is 320400131437. The reversal of 320400131420 is 24131004023.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 320400131392 and 320400131401.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2900411 + ... + 3008850.

It is an arithmetic number, because the mean of its divisors is an integer number (28045357452).

Almost surely, 2^320400131420 is an apocalyptic number.

It is an amenable number.

320400131420 is an abundant number, since it is smaller than the sum of its proper divisors (352688447428).

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

320400131420 is a wasteful number, since it uses less digits than its factorization.

320400131420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5911981 (or 5911979 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 320400131420 its reverse (24131004023), we get a palindrome (344531135443).

The spelling of 320400131420 in words is "three hundred twenty billion, four hundred million, one hundred thirty-one thousand, four hundred twenty".