1031120220 has 192 divisors, whose sum is σ = 3233793024. Its totient is φ = 243855360.

The previous prime is 1031120219. The next prime is 1031120231. The reversal of 1031120220 is 220211301.

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 = 1031120196 and 1031120205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2381124 + ... + 2381556.

It is an arithmetic number, because the mean of its divisors is an integer number (16842672).

Almost surely, 2^1031120220 is an apocalyptic number.

1031120220 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 1031120220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1616896512).

1031120220 is an abundant number, since it is smaller than the sum of its proper divisors (2202672804).

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

1031120220 is a wasteful number, since it uses less digits than its factorization.

1031120220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572 (or 570 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 1031120220 is about 32111.0607112253. The cubic root of 1031120220 is about 1010.2676217913.

Adding to 1031120220 its reverse (220211301), we get a palindrome (1251331521).

The spelling of 1031120220 in words is "one billion, thirty-one million, one hundred twenty thousand, two hundred twenty".