1220044520 has 32 divisors (see below), whose sum is σ = 2752050600. Its totient is φ = 486782208.

The previous prime is 1220044519. The next prime is 1220044531. The reversal of 1220044520 is 254400221.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1219546084 + 498436 = 34922^2 + 706^2 .

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 = 1220044492 and 1220044501.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22535 + ... + 54294.

Almost surely, 2^1220044520 is an apocalyptic number.

1220044520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220044520 is an abundant number, since it is smaller than the sum of its proper divisors (1532006080).

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

1220044520 is a wasteful number, since it uses less digits than its factorization.

1220044520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77237 (or 77233 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 1220044520 is about 34929.1356892781. The cubic root of 1220044520 is about 1068.5427275163.

Adding to 1220044520 its reverse (254400221), we get a palindrome (1474444741).

The spelling of 1220044520 in words is "one billion, two hundred twenty million, forty-four thousand, five hundred twenty".