20639897624 has 16 divisors (see below), whose sum is σ = 38702196600. Its totient is φ = 10319311872.

The previous prime is 20639897623. The next prime is 20639897683. The reversal of 20639897624 is 42679893602.

It is a self number, because there is not a number n which added to its sum of digits gives 20639897624.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20639897623) 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 3 ways as a sum of consecutive naturals, for example, 75992 + ... + 216920.

Almost surely, 2^20639897624 is an apocalyptic number.

It is an amenable number.

20639897624 is a deficient number, since it is larger than the sum of its proper divisors (18062298976).

20639897624 is a wasteful number, since it uses less digits than its factorization.

20639897624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159242 (or 159238 counting only the distinct ones).

The product of its (nonzero) digits is 7838208, while the sum is 56.

The spelling of 20639897624 in words is "twenty billion, six hundred thirty-nine million, eight hundred ninety-seven thousand, six hundred twenty-four".