320421420 has 120 divisors (see below), whose sum is σ = 1096614288. Its totient is φ = 77673600.

The previous prime is 320421391. The next prime is 320421433. The reversal of 320421420 is 24124023.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 320421393 and 320421402.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 8830 + ... + 26810.

Almost surely, 2^320421420 is an apocalyptic number.

320421420 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 320421420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (548307144).

320421420 is an abundant number, since it is smaller than the sum of its proper divisors (776192868).

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

320421420 is a wasteful number, since it uses less digits than its factorization.

320421420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18013 (or 18002 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 320421420 is about 17900.3189915711. The cubic root of 320421420 is about 684.2905044867.

Adding to 320421420 its reverse (24124023), we get a palindrome (344545443).

The spelling of 320421420 in words is "three hundred twenty million, four hundred twenty-one thousand, four hundred twenty".