1305032220 has 72 divisors (see below), whose sum is σ = 3961548864. Its totient is φ = 347749248.

The previous prime is 1305032191. The next prime is 1305032237. The reversal of 1305032220 is 222305031.

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 = 1305032193 and 1305032202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 444397 + ... + 447323.

It is an arithmetic number, because the mean of its divisors is an integer number (55021512).

Almost surely, 2^1305032220 is an apocalyptic number.

1305032220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1305032220 is an abundant number, since it is smaller than the sum of its proper divisors (2656516644).

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

1305032220 is a wasteful number, since it uses less digits than its factorization.

1305032220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5419 (or 5414 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 1305032220 is about 36125.2296878511. The cubic root of 1305032220 is about 1092.7993081201.

Adding to 1305032220 its reverse (222305031), we get a palindrome (1527337251).

The spelling of 1305032220 in words is "one billion, three hundred five million, thirty-two thousand, two hundred twenty".