21164815

素因数分解:

$5^1\times 7^4\times {\mathrm{41}}^1\times {\mathrm{43}}^1$

素因数の和:117

約数の個数: 40

約数和(自身を含む): 31057488

約数和(自身を除く): 9892673

約数列:

[1, 5, 7, 35, 41, 43, 49, 205, 215, 245, 287, 301, 343, 1435, 1505, 1715, 1763, 2009, 2107, 2401, 8815, 10045, 10535, 12005, 12341, 14063, 14749, 61705, 70315, 73745, 86387, 98441, 103243, 431935, 492205, 516215, 604709, 3023545, 4232963, 21164815]

約数ペア:

[(1, 21164815), (5, 4232963), (7, 3023545), (35, 604709), (41, 516215), (43, 492205), (49, 431935), (205, 103243), (215, 98441), (245, 86387), (287, 73745), (301, 70315), (343, 61705), (1435, 14749), (1505, 14063), (1715, 12341), (1763, 12005), (2009, 10535), (2107, 10045), (2401, 8815)]