1320220647 has 32 divisors (see below), whose sum is σ = 2025768960. Its totient is φ = 849229920.

The previous prime is 1320220637. The next prime is 1320220669. The reversal of 1320220647 is 7460220231.

1320220647 is a `hidden beast` number, since 13 + 2 + 0 + 2 + 2 + 0 + 647 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-1320220647 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 1320220647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320220607) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 82773 + ... + 97425.

It is an arithmetic number, because the mean of its divisors is an integer number (63305280).

Almost surely, 2^1320220647 is an apocalyptic number.

1320220647 is a deficient number, since it is larger than the sum of its proper divisors (705548313).

1320220647 is a wasteful number, since it uses less digits than its factorization.

1320220647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14780 (or 14774 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 1320220647 is about 36334.8406766839. The cubic root of 1320220647 is about 1097.0224286020.

Adding to 1320220647 its reverse (7460220231), we get a palindrome (8780440878).

The spelling of 1320220647 in words is "one billion, three hundred twenty million, two hundred twenty thousand, six hundred forty-seven".