20364306643640 has 64 divisors (see below), whose sum is σ = 47895585154560. Its totient is φ = 7777915136640.

The previous prime is 20364306643621. The next prime is 20364306643679. The reversal of 20364306643640 is 4634660346302.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18857444 + ... + 19908083.

It is an arithmetic number, because the mean of its divisors is an integer number (748368518040).

Almost surely, 2^{20364306643640} is an apocalyptic number.

20364306643640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20364306643640 is an abundant number, since it is smaller than the sum of its proper divisors (27531278510920).

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

20364306643640 is a wasteful number, since it uses less digits than its factorization.

20364306643640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38766132 (or 38766128 counting only the distinct ones).

The product of its (nonzero) digits is 4478976, while the sum is 47.

Adding to 20364306643640 its reverse (4634660346302), we get a palindrome (24998966989942).

The spelling of 20364306643640 in words is "twenty trillion, three hundred sixty-four billion, three hundred six million, six hundred forty-three thousand, six hundred forty".