20444910687 has 12 divisors (see below), whose sum is σ = 29535444640. Its totient is φ = 13628137248.

The previous prime is 20444910683. The next prime is 20444910721. The reversal of 20444910687 is 78601944402.

20444910687 is a `hidden beast` number, since 20 + 4 + 449 + 106 + 87 = 666.

It is not a de Polignac number, because 20444910687 - 2² = 20444910683 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20444910683) 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 11 ways as a sum of consecutive naturals, for example, 76558 + ... + 216219.

Almost surely, 2^20444910687 is an apocalyptic number.

20444910687 is a deficient number, since it is larger than the sum of its proper divisors (9090533953).

20444910687 is a wasteful number, since it uses less digits than its factorization.

20444910687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300542 (or 300539 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The spelling of 20444910687 in words is "twenty billion, four hundred forty-four million, nine hundred ten thousand, six hundred eighty-seven".