1920323961820 has 48 divisors (see below), whose sum is σ = 4404877964928. Its totient is φ = 697412266560.

The previous prime is 1920323961811. The next prime is 1920323961847. The reversal of 1920323961820 is 281693230291.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5372442 + ... + 5718721.

It is an arithmetic number, because the mean of its divisors is an integer number (91768290936).

Almost surely, 2^{1920323961820} is an apocalyptic number.

1920323961820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1920323961820 is an abundant number, since it is smaller than the sum of its proper divisors (2484554003108).

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

1920323961820 is a wasteful number, since it uses less digits than its factorization.

1920323961820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11091970 (or 11091968 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 46.

The spelling of 1920323961820 in words is "one trillion, nine hundred twenty billion, three hundred twenty-three million, nine hundred sixty-one thousand, eight hundred twenty".