20661159584 has 48 divisors (see below), whose sum is σ = 43818112800. Its totient is φ = 9533203200.

The previous prime is 20661159583. The next prime is 20661159587. The reversal of 20661159584 is 48595116602.

It is not an unprimeable number, because it can be changed into a prime (20661159581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2679767 + ... + 2687465.

It is an arithmetic number, because the mean of its divisors is an integer number (912877350).

Almost surely, 2^20661159584 is an apocalyptic number.

It is an amenable number.

20661159584 is an abundant number, since it is smaller than the sum of its proper divisors (23156953216).

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

20661159584 is a wasteful number, since it uses less digits than its factorization.

20661159584 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14173 (or 14165 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 47.

The spelling of 20661159584 in words is "twenty billion, six hundred sixty-one million, one hundred fifty-nine thousand, five hundred eighty-four".