20424640684 has 48 divisors (see below), whose sum is σ = 43273355328. Its totient is φ = 8234477568.

The previous prime is 20424640657. The next prime is 20424640693. The reversal of 20424640684 is 48604642402.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1082112 + ... + 1100824.

It is an arithmetic number, because the mean of its divisors is an integer number (901528236).

Almost surely, 2^20424640684 is an apocalyptic number.

It is an amenable number.

20424640684 is an abundant number, since it is smaller than the sum of its proper divisors (22848714644).

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

20424640684 is a wasteful number, since it uses less digits than its factorization.

20424640684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21034 (or 21032 counting only the distinct ones).

The product of its (nonzero) digits is 294912, while the sum is 40.

The spelling of 20424640684 in words is "twenty billion, four hundred twenty-four million, six hundred forty thousand, six hundred eighty-four".