1244322020 has 72 divisors (see below), whose sum is σ = 2731075704. Its totient is φ = 476160000.

The previous prime is 1244322019. The next prime is 1244322029. The reversal of 1244322020 is 202234421.

It can be written as a sum of positive squares in 4 ways, for example, as 700872676 + 543449344 = 26474^2 + 23312^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1244321983 and 1244322001.

It is not an unprimeable number, because it can be changed into a prime (1244322029) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1940900 + ... + 1941540.

It is an arithmetic number, because the mean of its divisors is an integer number (37931607).

Almost surely, 2^1244322020 is an apocalyptic number.

1244322020 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 1244322020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1365537852).

1244322020 is an abundant number, since it is smaller than the sum of its proper divisors (1486753684).

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

1244322020 is a wasteful number, since it uses less digits than its factorization.

1244322020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 813 (or 780 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 1244322020 is about 35274.9489014513. The cubic root of 1244322020 is about 1075.5838242098.

Adding to 1244322020 its reverse (202234421), we get a palindrome (1446556441).

The spelling of 1244322020 in words is "one billion, two hundred forty-four million, three hundred twenty-two thousand, twenty".