19893707920 has 20 divisors (see below), whose sum is σ = 46252871100. Its totient is φ = 7957483136.

The previous prime is 19893707917. The next prime is 19893707957. The reversal of 19893707920 is 2970739891.

It can be written as a sum of positive squares in 2 ways, for example, as 5925304576 + 13968403344 = 76976^2 + 118188^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×19893707920² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 124335595 + ... + 124335754.

It is an arithmetic number, because the mean of its divisors is an integer number (2312643555).

Almost surely, 2^19893707920 is an apocalyptic number.

19893707920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19893707920 is an abundant number, since it is smaller than the sum of its proper divisors (26359163180).

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

19893707920 is a wasteful number, since it uses less digits than its factorization.

19893707920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248671362 (or 248671356 counting only the distinct ones).

The product of its (nonzero) digits is 1714608, while the sum is 55.

The spelling of 19893707920 in words is "nineteen billion, eight hundred ninety-three million, seven hundred seven thousand, nine hundred twenty".