20856799353600 has 3240 divisors, whose sum is σ = 93029260746240. Its totient is φ = 4448030146560.

The previous prime is 20856799353581. The next prime is 20856799353641. The reversal of 20856799353600 is 635399765802.

20856799353600 is a `hidden beast` number, since 2 + 0 + 8 + 5 + 6 + 7 + 9 + 93 + 536 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 359 ways as a sum of consecutive naturals, for example, 251286739159 + ... + 251286739241.

Almost surely, 2^{20856799353600} is an apocalyptic number.

20856799353600 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 20856799353600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46514630373120).

20856799353600 is an abundant number, since it is smaller than the sum of its proper divisors (72172461392640).

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

20856799353600 is an equidigital number, since it uses as much as digits as its factorization.

20856799353600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245 (or 202 counting only the distinct ones).

The product of its (nonzero) digits is 73483200, while the sum is 63.

The spelling of 20856799353600 in words is "twenty trillion, eight hundred fifty-six billion, seven hundred ninety-nine million, three hundred fifty-three thousand, six hundred".