7320420 has 72 divisors (see below), whose sum is σ = 22573824. Its totient is φ = 1919808.

The previous prime is 7320419. The next prime is 7320437. The reversal of 7320420 is 240237.

It is a happy number.

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 = 7320393 and 7320402.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11757 + ... + 12363.

Almost surely, 2^7320420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7320420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11286912).

7320420 is an abundant number, since it is smaller than the sum of its proper divisors (15253404).

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

7320420 is a wasteful number, since it uses less digits than its factorization.

7320420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 689 (or 684 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 18.

The square root of 7320420 is about 2705.6274688138. The cubic root of 7320420 is about 194.1684511329.

Adding to 7320420 its reverse (240237), we get a palindrome (7560657).

The spelling of 7320420 in words is "seven million, three hundred twenty thousand, four hundred twenty".