1220023220 has 24 divisors (see below), whose sum is σ = 2759130024. Its totient is φ = 450470016.

The previous prime is 1220023213. The next prime is 1220023253. The reversal of 1220023220 is 223200221.

It can be written as a sum of positive squares in 4 ways, for example, as 286354084 + 933669136 = 16922^2 + 30556^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1220023195 and 1220023204.

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 7 ways as a sum of consecutive naturals, for example, 2345939 + ... + 2346458.

It is an arithmetic number, because the mean of its divisors is an integer number (114963751).

Almost surely, 2^1220023220 is an apocalyptic number.

1220023220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220023220 is an abundant number, since it is smaller than the sum of its proper divisors (1539106804).

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

1220023220 is a wasteful number, since it uses less digits than its factorization.

1220023220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4692419 (or 4692417 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 1220023220 is about 34928.8307848975. The cubic root of 1220023220 is about 1068.5365091387.

Adding to 1220023220 its reverse (223200221), we get a palindrome (1443223441).

The spelling of 1220023220 in words is "one billion, two hundred twenty million, twenty-three thousand, two hundred twenty".