1320820743 has 24 divisors (see below), whose sum is σ = 1963048320. Its totient is φ = 783422320.

The previous prime is 1320820741. The next prime is 1320820769. The reversal of 1320820743 is 3470280231.

It is not a de Polignac number, because 1320820743 - 2¹ = 1320820741 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1320820743.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320820741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63838 + ... + 81956.

It is an arithmetic number, because the mean of its divisors is an integer number (81793680).

Almost surely, 2^1320820743 is an apocalyptic number.

1320820743 is a deficient number, since it is larger than the sum of its proper divisors (642227577).

1320820743 is a wasteful number, since it uses less digits than its factorization.

1320820743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18227 (or 18180 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 1320820743 is about 36343.0975977558. The cubic root of 1320820743 is about 1097.1886177546.

The spelling of 1320820743 in words is "one billion, three hundred twenty million, eight hundred twenty thousand, seven hundred forty-three".