3131120220 has 96 divisors (see below), whose sum is σ = 9040937472. Its totient is φ = 809273088.

The previous prime is 3131120189. The next prime is 3131120221. The reversal of 3131120220 is 220211313.

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 3131120220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3131120221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 258009 + ... + 269871.

It is an arithmetic number, because the mean of its divisors is an integer number (94176432).

Almost surely, 2^3131120220 is an apocalyptic number.

3131120220 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 3131120220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4520468736).

3131120220 is an abundant number, since it is smaller than the sum of its proper divisors (5909817252).

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

3131120220 is a wasteful number, since it uses less digits than its factorization.

3131120220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12011 (or 12009 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 3131120220 is about 55956.4135734234. The cubic root of 3131120220 is about 1462.9626804050.

Adding to 3131120220 its reverse (220211313), we get a palindrome (3351331533).

The spelling of 3131120220 in words is "three billion, one hundred thirty-one million, one hundred twenty thousand, two hundred twenty".