20716781553600 has 168 divisors, whose sum is σ = 74147244713088. Its totient is φ = 5022250060800.

The previous prime is 20716781553593. The next prime is 20716781553607. The reversal of 20716781553600 is 635518761702.

It is an interprime number because it is at equal distance from previous prime (20716781553593) and next prime (20716781553607).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20716781553607) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 196128844 + ... + 196234443.

Almost surely, 2^{20716781553600} is an apocalyptic number.

20716781553600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20716781553600 is an abundant number, since it is smaller than the sum of its proper divisors (53430463159488).

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

20716781553600 is a wasteful number, since it uses less digits than its factorization.

20716781553600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392363323 (or 392363308 counting only the distinct ones).

The product of its (nonzero) digits is 2116800, while the sum is 51.

The spelling of 20716781553600 in words is "twenty trillion, seven hundred sixteen billion, seven hundred eighty-one million, five hundred fifty-three thousand, six hundred".