20813666361600 has 432 divisors, whose sum is σ = 78514851477888. Its totient is φ = 4756643512320.

The previous prime is 20813666361571. The next prime is 20813666361623. The reversal of 20813666361600 is 616366631802.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 20813666361600.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 1574758192 + ... + 1574771408.

It is an arithmetic number, because the mean of its divisors is an integer number (181747341384).

Almost surely, 2^{20813666361600} is an apocalyptic number.

20813666361600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20813666361600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39257425738944).

20813666361600 is an abundant number, since it is smaller than the sum of its proper divisors (57701185116288).

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

20813666361600 is a wasteful number, since it uses less digits than its factorization.

20813666361600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24970 (or 24951 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 48.

The spelling of 20813666361600 in words is "twenty trillion, eight hundred thirteen billion, six hundred sixty-six million, three hundred sixty-one thousand, six hundred".