19886506344 has 40 divisors (see below), whose sum is σ = 55700633010. Its totient is φ = 6628835232.

The previous prime is 19886506271. The next prime is 19886506357. The reversal of 19886506344 is 44360568891.

19886506344 is a `hidden beast` number, since 1 + 98 + 8 + 6 + 506 + 3 + 44 = 666.

It can be written as a sum of positive squares in only one way, i.e., 15021443844 + 4865062500 = 122562^2 + 69750^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 15343879 + ... + 15345174.

Almost surely, 2^19886506344 is an apocalyptic number.

It is an amenable number.

19886506344 is an abundant number, since it is smaller than the sum of its proper divisors (35814126666).

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

19886506344 is a wasteful number, since it uses less digits than its factorization.

19886506344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30689071 (or 30689058 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 54.

The spelling of 19886506344 in words is "nineteen billion, eight hundred eighty-six million, five hundred six thousand, three hundred forty-four".