19986742536 has 32 divisors (see below), whose sum is σ = 50670619200. Its totient is φ = 6568412480.

The previous prime is 19986742513. The next prime is 19986742543. The reversal of 19986742536 is 63524768991.

It is a super-2 number, since 2×19986742536² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19986742536.

It is an unprimeable number.

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, 5862951 + ... + 5866358.

It is an arithmetic number, because the mean of its divisors is an integer number (1583456850).

Almost surely, 2^19986742536 is an apocalyptic number.

It is an amenable number.

19986742536 is an abundant number, since it is smaller than the sum of its proper divisors (30683876664).

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

19986742536 is a wasteful number, since it uses less digits than its factorization.

19986742536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11729389 (or 11729385 counting only the distinct ones).

The product of its digits is 19595520, while the sum is 60.

The spelling of 19986742536 in words is "nineteen billion, nine hundred eighty-six million, seven hundred forty-two thousand, five hundred thirty-six".