20009989818624 has 72 divisors (see below), whose sum is σ = 57352350654592. Its totient is φ = 6156919941120.

The previous prime is 20009989818571. The next prime is 20009989818667. The reversal of 20009989818624 is 42681898990002.

It is a happy number.

It is a super-2 number, since 2×20009989818624² (a number of 27 digits) contains 22 as substring.

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, 1002092872 + ... + 1002112839.

Almost surely, 2^{20009989818624} is an apocalyptic number.

20009989818624 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20009989818624 is an abundant number, since it is smaller than the sum of its proper divisors (37342360835968).

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

20009989818624 is a wasteful number, since it uses less digits than its factorization.

20009989818624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2004205743 (or 2004205729 counting only the distinct ones).

The product of its (nonzero) digits is 35831808, while the sum is 66.

The spelling of 20009989818624 in words is "twenty trillion, nine billion, nine hundred eighty-nine million, eight hundred eighteen thousand, six hundred twenty-four".