10031220 has 72 divisors (see below), whose sum is σ = 31764096. Its totient is φ = 2557632.

The previous prime is 10031191. The next prime is 10031227. The reversal of 10031220 is 2213001.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10031227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2929 + ... + 5351.

It is an arithmetic number, because the mean of its divisors is an integer number (441168).

Almost surely, 2^10031220 is an apocalyptic number.

10031220 is a gapful number since it is divisible by the number (10) 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 10031220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15882048).

10031220 is an abundant number, since it is smaller than the sum of its proper divisors (21732876).

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

10031220 is a wasteful number, since it uses less digits than its factorization.

10031220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2461 (or 2456 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 10031220 is about 3167.2101288042. The cubic root of 10031220 is about 215.6674409213.

Adding to 10031220 its reverse (2213001), we get a palindrome (12244221).

The spelling of 10031220 in words is "ten million, thirty-one thousand, two hundred twenty".