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Every number underlined is a factor of 60.
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60
1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60
Other numbers below 100 also with 12 factors:
| 72 | 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72 |
| 84 | 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84 |
Every number underlined is a factor of 36.
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1, 2, 3, 4, 6, 9, 12, 18, 36
Other numbers greater than 1 and less than 100 with an odd number of factors:
| 4 | 1, 2, 4 |
| 9 | 1, 3, 9 |
| 16 | 1, 2, 4, 8, 16 |
| 25 | 1, 5, 25 |
| 49 | 1, 7, 49 |
| 64 | 1, 2, 4, 8, 16, 32, 64 |
| 81 | 1, 3, 9, 27, 81 |
All of these numbers are square numbers, as by having a number that multiplies by itself to create that number (eg 5 x 5 = 25), you get an odd number of factors.
All numbers underlined are multiples of 13 that have digits that add up to 13.
| 104 | 117 | 130 |
| 143 | 156 | 169 |
| 182 | 195 | 208 |
| 221 | 234 | 247 |
| 260 | 273 | 286 |
| 299 | 312 | 325 |
| 338 | 351 | 364 |
| 377 | 390 | 403 |
| 416 | 429 | 442 |
| 455 | 468 | 481 |
| 494 | 507 | 520 |
| 533 | 546 | 559 |
| 572 | 585 | 598 |
| 611 | 624 | 637 |
| 650 | 663 | 676 |
| 689 | 702 | 715 |
| 728 | 741 | 754 |
| 767 | 780 | 793 |
| 806 | 819 | 832 |
| 845 | 858 | 871 |
| 884 | 897 | 910 |
| 923 | 936 | 949 |
| 926 | 975 | 988 |
247, 364, 481, 715, 832
Leo T 