1320212720 has 40 divisors (see below), whose sum is σ = 3231050640. Its totient is φ = 500290560.

The previous prime is 1320212711. The next prime is 1320212731. The reversal of 1320212720 is 272120231.

It is a tau number, because it is divible by the number of its divisors (40).

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 = 1320212692 and 1320212701.

It is a congruent number.

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, 432761 + ... + 435800.

It is an arithmetic number, because the mean of its divisors is an integer number (80776266).

Almost surely, 2^1320212720 is an apocalyptic number.

1320212720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1320212720 is an abundant number, since it is smaller than the sum of its proper divisors (1910837920).

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

1320212720 is a wasteful number, since it uses less digits than its factorization.

1320212720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868593 (or 868587 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 1320212720 is about 36334.7315938896. The cubic root of 1320212720 is about 1097.0202329806.

Adding to 1320212720 its reverse (272120231), we get a palindrome (1592332951).

The spelling of 1320212720 in words is "one billion, three hundred twenty million, two hundred twelve thousand, seven hundred twenty".