30131220 has 48 divisors (see below), whose sum is σ = 96421248. Its totient is φ = 6887040.

The previous prime is 30131201. The next prime is 30131243. The reversal of 30131220 is 2213103.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 30131196 and 30131205.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35451 + ... + 36290.

It is an arithmetic number, because the mean of its divisors is an integer number (2008776).

Almost surely, 2^30131220 is an apocalyptic number.

30131220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

30131220 is an abundant number, since it is smaller than the sum of its proper divisors (66290028).

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

30131220 is a wasteful number, since it uses less digits than its factorization.

30131220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71760 (or 71758 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 30131220 is about 5489.1911972530. The cubic root of 30131220 is about 311.1756261709.

Adding to 30131220 its reverse (2213103), we get a palindrome (32344323).

The spelling of 30131220 in words is "thirty million, one hundred thirty-one thousand, two hundred twenty".