20654663634 has 32 divisors (see below), whose sum is σ = 50071913280. Its totient is φ = 6258988800.

The previous prime is 20654663543. The next prime is 20654663639. The reversal of 20654663634 is 43636645602.

20654663634 is a `hidden beast` number, since 2 + 0 + 6 + 5 + 4 + 6 + 6 + 3 + 634 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 20654663634.

It is not an unprimeable number, because it can be changed into a prime (20654663639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17385487 + ... + 17386674.

It is an arithmetic number, because the mean of its divisors is an integer number (1564747290).

Almost surely, 2^20654663634 is an apocalyptic number.

20654663634 is an abundant number, since it is smaller than the sum of its proper divisors (29417249646).

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

20654663634 is a wasteful number, since it uses less digits than its factorization.

20654663634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34772183 (or 34772177 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 45.

The spelling of 20654663634 in words is "twenty billion, six hundred fifty-four million, six hundred sixty-three thousand, six hundred thirty-four".