31241220 has 48 divisors (see below), whose sum is σ = 89517120. Its totient is φ = 8136576.

The previous prime is 31241179. The next prime is 31241227. The reversal of 31241220 is 2214213.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 31241220.

It is not an unprimeable number, because it can be changed into a prime (31241227) by changing a digit.

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, 3475 + ... + 8634.

It is an arithmetic number, because the mean of its divisors is an integer number (1864940).

Almost surely, 2^31241220 is an apocalyptic number.

31241220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31241220 is an abundant number, since it is smaller than the sum of its proper divisors (58275900).

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

31241220 is a wasteful number, since it uses less digits than its factorization.

31241220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12164 (or 12162 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 31241220 is about 5589.3845815081. The cubic root of 31241220 is about 314.9507607591.

Adding to 31241220 its reverse (2214213), we get a palindrome (33455433).

The spelling of 31241220 in words is "thirty-one million, two hundred forty-one thousand, two hundred twenty".