Base | Representation |
---|---|
bin | 100111100001… |
… | …0111001100000 |
3 | 1102222202012122 |
4 | 1033002321200 |
5 | 20301034443 |
6 | 2020043412 |
7 | 341061542 |
oct | 117027140 |
9 | 42882178 |
10 | 20721248 |
11 | 107731a9 |
12 | 6b33568 |
13 | 43a67c2 |
14 | 2a75692 |
15 | 1c44968 |
hex | 13c2e60 |
20721248 has 48 divisors (see below), whose sum is σ = 43409520. Its totient is φ = 9709056.
The previous prime is 20721223. The next prime is 20721263. The reversal of 20721248 is 84212702.
It is a congruent number.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105086 + ... + 105282.
It is an arithmetic number, because the mean of its divisors is an integer number (904365).
Almost surely, 220721248 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 20721248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21704760).
20721248 is an abundant number, since it is smaller than the sum of its proper divisors (22688272).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20721248 is a wasteful number, since it uses less digits than its factorization.
20721248 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 399 (or 391 counting only the distinct ones).
The product of its (nonzero) digits is 1792, while the sum is 26.
The square root of 20721248 is about 4552.0597535621. The cubic root of 20721248 is about 274.6662529712. Note that the first 3 decimals are identical.
The spelling of 20721248 in words is "twenty million, seven hundred twenty-one thousand, two hundred forty-eight".
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