1220322540 has 24 divisors (see below), whose sum is σ = 3416903280. Its totient is φ = 325419328.

The previous prime is 1220322527. The next prime is 1220322541. The reversal of 1220322540 is 452230221.

It is not an unprimeable number, because it can be changed into a prime (1220322541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10169295 + ... + 10169414.

It is an arithmetic number, because the mean of its divisors is an integer number (142370970).

Almost surely, 2^1220322540 is an apocalyptic number.

1220322540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220322540 is an abundant number, since it is smaller than the sum of its proper divisors (2196580740).

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

1220322540 is a wasteful number, since it uses less digits than its factorization.

1220322540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20338721 (or 20338719 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 1220322540 is about 34933.1152346881. The cubic root of 1220322540 is about 1068.6238867641.

Adding to 1220322540 its reverse (452230221), we get a palindrome (1672552761).

It can be divided in two parts, 12203 and 22540, that added together give a palindrome (34743).

The spelling of 1220322540 in words is "one billion, two hundred twenty million, three hundred twenty-two thousand, five hundred forty".