20581935968 has 24 divisors (see below), whose sum is σ = 44204385960. Its totient is φ = 9355425280.

The previous prime is 20581935967. The next prime is 20581935973. The reversal of 20581935968 is 86953918502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20581935967) 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, 29235353 + ... + 29236056.

It is an arithmetic number, because the mean of its divisors is an integer number (1841849415).

Almost surely, 2^20581935968 is an apocalyptic number.

It is an amenable number.

20581935968 is an abundant number, since it is smaller than the sum of its proper divisors (23622449992).

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

20581935968 is a wasteful number, since it uses less digits than its factorization.

20581935968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58471430 (or 58471422 counting only the distinct ones).

The product of its (nonzero) digits is 4665600, while the sum is 56.

The spelling of 20581935968 in words is "twenty billion, five hundred eighty-one million, nine hundred thirty-five thousand, nine hundred sixty-eight".