1243320220 has 12 divisors (see below), whose sum is σ = 2610972504. Its totient is φ = 497328080.

The previous prime is 1243320191. The next prime is 1243320229. The reversal of 1243320220 is 220233421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243320229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31082986 + ... + 31083025.

It is an arithmetic number, because the mean of its divisors is an integer number (217581042).

Almost surely, 2^1243320220 is an apocalyptic number.

1243320220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243320220 is an abundant number, since it is smaller than the sum of its proper divisors (1367652284).

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

1243320220 is a wasteful number, since it uses less digits than its factorization.

1243320220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62166020 (or 62166018 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 1243320220 is about 35260.7461634039. The cubic root of 1243320220 is about 1075.2950969199.

Adding to 1243320220 its reverse (220233421), we get a palindrome (1463553641).

The spelling of 1243320220 in words is "one billion, two hundred forty-three million, three hundred twenty thousand, two hundred twenty".