19855714820 has 24 divisors (see below), whose sum is σ = 41798967000. Its totient is φ = 7922863872.

The previous prime is 19855714793. The next prime is 19855714829. The reversal of 19855714820 is 2841755891.

It can be written as a sum of positive squares in 4 ways, for example, as 1203257344 + 18652457476 = 34688^2 + 136574^2 .

It is a super-2 number, since 2×19855714820² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19855714829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1205495 + ... + 1221854.

It is an arithmetic number, because the mean of its divisors is an integer number (1741623625).

Almost surely, 2^19855714820 is an apocalyptic number.

19855714820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19855714820 is an abundant number, since it is smaller than the sum of its proper divisors (21943252180).

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

19855714820 is a wasteful number, since it uses less digits than its factorization.

19855714820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2427767 (or 2427765 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 50.

The spelling of 19855714820 in words is "nineteen billion, eight hundred fifty-five million, seven hundred fourteen thousand, eight hundred twenty".