1220304720 has 80 divisors (see below), whose sum is σ = 3786311232. Its totient is φ = 325125120.

The previous prime is 1220304691. The next prime is 1220304731. The reversal of 1220304720 is 274030221.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 498700 + ... + 501140.

Almost surely, 2^1220304720 is an apocalyptic number.

1220304720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220304720 is an abundant number, since it is smaller than the sum of its proper divisors (2566006512).

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

1220304720 is a wasteful number, since it uses less digits than its factorization.

1220304720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4540 (or 4534 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 1220304720 is about 34932.8601749127. The cubic root of 1220304720 is about 1068.6186851419.

Adding to 1220304720 its reverse (274030221), we get a palindrome (1494334941).

The spelling of 1220304720 in words is "one billion, two hundred twenty million, three hundred four thousand, seven hundred twenty".