20581443682 has 16 divisors (see below), whose sum is σ = 32590152000. Its totient is φ = 9721164240.

The previous prime is 20581443677. The next prime is 20581443689. The reversal of 20581443682 is 28634418502.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20581443689) 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 7 ways as a sum of consecutive naturals, for example, 762694 + ... + 789217.

It is an arithmetic number, because the mean of its divisors is an integer number (2036884500).

Almost surely, 2^20581443682 is an apocalyptic number.

20581443682 is a deficient number, since it is larger than the sum of its proper divisors (12008708318).

20581443682 is a wasteful number, since it uses less digits than its factorization.

20581443682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1552281.

The product of its (nonzero) digits is 368640, while the sum is 43.

The spelling of 20581443682 in words is "twenty billion, five hundred eighty-one million, four hundred forty-three thousand, six hundred eighty-two".