1081520220 has 96 divisors (see below), whose sum is σ = 3308739840. Its totient is φ = 261775360.

The previous prime is 1081520197. The next prime is 1081520239. The reversal of 1081520220 is 220251801.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 766876 + ... + 768284.

It is an arithmetic number, because the mean of its divisors is an integer number (34466040).

Almost surely, 2^1081520220 is an apocalyptic number.

1081520220 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 1081520220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1654369920).

1081520220 is an abundant number, since it is smaller than the sum of its proper divisors (2227219620).

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

1081520220 is a wasteful number, since it uses less digits than its factorization.

1081520220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2595 (or 2593 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 1081520220 is about 32886.4747274620. The cubic root of 1081520220 is about 1026.4667385380.

The spelling of 1081520220 in words is "one billion, eighty-one million, five hundred twenty thousand, two hundred twenty".