30031220 has 12 divisors (see below), whose sum is σ = 63065604. Its totient is φ = 12012480.

The previous prime is 30031217. The next prime is 30031223. The reversal of 30031220 is 2213003.

It is an interprime number because it is at equal distance from previous prime (30031217) and next prime (30031223).

It can be written as a sum of positive squares in 2 ways, for example, as 7997584 + 22033636 = 2828^2 + 4694^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30031223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 750761 + ... + 750800.

It is an arithmetic number, because the mean of its divisors is an integer number (5255467).

Almost surely, 2^30031220 is an apocalyptic number.

It is an amenable number.

30031220 is an abundant number, since it is smaller than the sum of its proper divisors (33034384).

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

30031220 is a wasteful number, since it uses less digits than its factorization.

30031220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1501570 (or 1501568 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 11.

The square root of 30031220 is about 5480.0748170075. The cubic root of 30031220 is about 310.8309996702.

Adding to 30031220 its reverse (2213003), we get a palindrome (32244223).

The spelling of 30031220 in words is "thirty million, thirty-one thousand, two hundred twenty".