20643385044600 has 288 divisors, whose sum is σ = 74675206195200. Its totient is φ = 5095702022400.

The previous prime is 20643385044589. The next prime is 20643385044619. The reversal of 20643385044600 is 644058334602.

20643385044600 is a `hidden beast` number, since 2 + 0 + 6 + 4 + 3 + 38 + 5 + 0 + 4 + 4 + 600 = 666.

It is a super-2 number, since 2×20643385044600² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

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 71 ways as a sum of consecutive naturals, for example, 6759060 + ... + 9325859.

It is an arithmetic number, because the mean of its divisors is an integer number (259288910400).

Almost surely, 2^{20643385044600} is an apocalyptic number.

20643385044600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20643385044600 is an abundant number, since it is smaller than the sum of its proper divisors (54031821150600).

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

20643385044600 is a wasteful number, since it uses less digits than its factorization.

20643385044600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16084995 (or 16084983 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 45.

The spelling of 20643385044600 in words is "twenty trillion, six hundred forty-three billion, three hundred eighty-five million, forty-four thousand, six hundred".