20563845120 has 672 divisors, whose sum is σ = 87876839232. Its totient is φ = 4331667456.

The previous prime is 20563845109. The next prime is 20563845121. The reversal of 20563845120 is 2154836502.

20563845120 is a `hidden beast` number, since 2 + 0 + 5 + 63 + 84 + 512 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (672).

It is a super-2 number, since 2×20563845120² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20563845121) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 33545934 + ... + 33546546.

It is an arithmetic number, because the mean of its divisors is an integer number (130769106).

Almost surely, 2^20563845120 is an apocalyptic number.

20563845120 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 20563845120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43938419616).

20563845120 is an abundant number, since it is smaller than the sum of its proper divisors (67312994112).

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

20563845120 is a wasteful number, since it uses less digits than its factorization.

20563845120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670 (or 643 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The spelling of 20563845120 in words is "twenty billion, five hundred sixty-three million, eight hundred forty-five thousand, one hundred twenty".