1920209939844 has 120 divisors (see below), whose sum is σ = 5395540217088. Its totient is φ = 530933376960.

The previous prime is 1920209939839. The next prime is 1920209939863. The reversal of 1920209939844 is 4489399020291.

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 39 ways as a sum of consecutive naturals, for example, 181767 + ... + 1968110.

Almost surely, 2^{1920209939844} is an apocalyptic number.

1920209939844 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1920209939844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2697770108544).

1920209939844 is an abundant number, since it is smaller than the sum of its proper divisors (3475330277244).

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

1920209939844 is a wasteful number, since it uses less digits than its factorization.

1920209939844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2149943 (or 2149920 counting only the distinct ones).

The product of its (nonzero) digits is 10077696, while the sum is 60.

The spelling of 1920209939844 in words is "one trillion, nine hundred twenty billion, two hundred nine million, nine hundred thirty-nine thousand, eight hundred forty-four".