451321220 has 48 divisors (see below), whose sum is σ = 1084597248. Its totient is φ = 154535040.

The previous prime is 451321217. The next prime is 451321223. The reversal of 451321220 is 22123154.

It is an interprime number because it is at equal distance from previous prime (451321217) and next prime (451321223).

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 = 451321192 and 451321201.

It is not an unprimeable number, because it can be changed into a prime (451321223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137114 + ... + 140366.

It is an arithmetic number, because the mean of its divisors is an integer number (22595776).

Almost surely, 2^451321220 is an apocalyptic number.

It is an amenable number.

451321220 is an abundant number, since it is smaller than the sum of its proper divisors (633276028).

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

451321220 is a wasteful number, since it uses less digits than its factorization.

451321220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4260 (or 4258 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 451321220 is about 21244.3220649660. The cubic root of 451321220 is about 767.0586724545.

Adding to 451321220 its reverse (22123154), we get a palindrome (473444374).

The spelling of 451321220 in words is "four hundred fifty-one million, three hundred twenty-one thousand, two hundred twenty".