Base | Representation |
---|---|
bin | 101001011011… |
… | …0110000100000 |
3 | 1111212111101000 |
4 | 1102312300200 |
5 | 21030020341 |
6 | 2053312000 |
7 | 352421616 |
oct | 122666040 |
9 | 44774330 |
10 | 21720096 |
11 | 112956a2 |
12 | 7335600 |
13 | 4666338 |
14 | 2c556b6 |
15 | 1d908b6 |
hex | 14b6c20 |
21720096 has 96 divisors (see below), whose sum is σ = 66165120. Its totient is φ = 6918912.
The previous prime is 21720053. The next prime is 21720109. The reversal of 21720096 is 69002712.
It is a tau number, because it is divible by the number of its divisors (96).
It is a Harshad number since it is a multiple of its sum of digits (27).
It is an unprimeable number.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19326 + ... + 20418.
It is an arithmetic number, because the mean of its divisors is an integer number (689220).
Almost surely, 221720096 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 21720096, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33082560).
21720096 is an abundant number, since it is smaller than the sum of its proper divisors (44445024).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21720096 is a wasteful number, since it uses less digits than its factorization.
21720096 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1135 (or 1121 counting only the distinct ones).
The product of its (nonzero) digits is 1512, while the sum is 27.
The square root of 21720096 is about 4660.4823784668. The cubic root of 21720096 is about 279.0105210508.
The spelling of 21720096 in words is "twenty-one million, seven hundred twenty thousand, ninety-six".
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