20563836400 has 60 divisors (see below), whose sum is σ = 50242041000. Its totient is φ = 8086109440.

The previous prime is 20563836373. The next prime is 20563836413. The reversal of 20563836400 is 463836502.

It is a self number, because there is not a number n which added to its sum of digits gives 20563836400.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 412075 + ... + 459274.

It is an arithmetic number, because the mean of its divisors is an integer number (837367350).

Almost surely, 2^20563836400 is an apocalyptic number.

20563836400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20563836400 is an abundant number, since it is smaller than the sum of its proper divisors (29678204600).

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

20563836400 is a wasteful number, since it uses less digits than its factorization.

20563836400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 871426 (or 871415 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 37.

The spelling of 20563836400 in words is "twenty billion, five hundred sixty-three million, eight hundred thirty-six thousand, four hundred".