20643895820632 has 16 divisors (see below), whose sum is σ = 44236919615760. Its totient is φ = 8847383923104.

The previous prime is 20643895820621. The next prime is 20643895820633. The reversal of 20643895820632 is 23602859834602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20643895820633) 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, 184320498343 + ... + 184320498454.

It is an arithmetic number, because the mean of its divisors is an integer number (2764807475985).

Almost surely, 2^{20643895820632} is an apocalyptic number.

It is an amenable number.

20643895820632 is an abundant number, since it is smaller than the sum of its proper divisors (23593023795128).

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

20643895820632 is a wasteful number, since it uses less digits than its factorization.

20643895820632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368640996810 (or 368640996806 counting only the distinct ones).

The product of its (nonzero) digits is 29859840, while the sum is 58.

The spelling of 20643895820632 in words is "twenty trillion, six hundred forty-three billion, eight hundred ninety-five million, eight hundred twenty thousand, six hundred thirty-two".