1220333220 has 36 divisors (see below), whose sum is σ = 3701677980. Its totient is φ = 325422144.

The previous prime is 1220333209. The next prime is 1220333237. The reversal of 1220333220 is 223330221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 519566436 + 700766784 = 22794^2 + 26472^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1220333193 and 1220333202.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3389635 + ... + 3389994.

Almost surely, 2^1220333220 is an apocalyptic number.

1220333220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220333220 is an abundant number, since it is smaller than the sum of its proper divisors (2481344760).

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

1220333220 is a wasteful number, since it uses less digits than its factorization.

1220333220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6779644 (or 6779639 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 1220333220 is about 34933.2680979035. The cubic root of 1220333220 is about 1068.6270042103.

Adding to 1220333220 its reverse (223330221), we get a palindrome (1443663441).

Subtracting from 1220333220 its reverse (223330221), we obtain a cube (997002999 = 999³).

The spelling of 1220333220 in words is "one billion, two hundred twenty million, three hundred thirty-three thousand, two hundred twenty".