Base | Representation |
---|---|
bin | 100111100001… |
… | …1110010100100 |
3 | 1102222221012220 |
4 | 1033003302210 |
5 | 20301144100 |
6 | 2020112340 |
7 | 341105310 |
oct | 117036244 |
9 | 42887186 |
10 | 20724900 |
11 | 10775a19 |
12 | 6b356b0 |
13 | 43a8371 |
14 | 2a76b40 |
15 | 1c45aa0 |
hex | 13c3ca4 |
20724900 has 144 divisors (see below), whose sum is σ = 69995520. Its totient is φ = 4636800.
The previous prime is 20724889. The next prime is 20724929. The reversal of 20724900 is 942702.
It is an unprimeable number.
It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 149031 + ... + 149169.
It is an arithmetic number, because the mean of its divisors is an integer number (486080).
Almost surely, 220724900 is an apocalyptic number.
20724900 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 20724900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34997760).
20724900 is an abundant number, since it is smaller than the sum of its proper divisors (49270620).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20724900 is a wasteful number, since it uses less digits than its factorization.
20724900 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 234 (or 227 counting only the distinct ones).
The product of its (nonzero) digits is 1008, while the sum is 24.
The square root of 20724900 is about 4552.4608729785. The cubic root of 20724900 is about 274.6823881356.
The spelling of 20724900 in words is "twenty million, seven hundred twenty-four thousand, nine hundred".
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