30317220 has 96 divisors (see below), whose sum is σ = 98461440. Its totient is φ = 7729920.

The previous prime is 30317207. The next prime is 30317233. The reversal of 30317220 is 2271303.

It is an interprime number because it is at equal distance from previous prime (30317207) and next prime (30317233).

It is a super-3 number, since 3×30317220³ (a number of 23 digits) contains 333 as substring.

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 = 30317193 and 30317202.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 11200 + ... + 13640.

It is an arithmetic number, because the mean of its divisors is an integer number (1025640).

Almost surely, 2^30317220 is an apocalyptic number.

30317220 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 30317220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49230720).

30317220 is an abundant number, since it is smaller than the sum of its proper divisors (68144220).

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

30317220 is a wasteful number, since it uses less digits than its factorization.

30317220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2482 (or 2474 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 18.

The square root of 30317220 is about 5506.1075180203. The cubic root of 30317220 is about 311.8146087968.

Adding to 30317220 its reverse (2271303), we get a palindrome (32588523).

The spelling of 30317220 in words is "thirty million, three hundred seventeen thousand, two hundred twenty".