21857115

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{43}}^1\times {\mathrm{47}}^1\times {\mathrm{103}}^1$

素因数の和:208

約数の個数: 64

約数和(自身を含む): 42172416

約数和(自身を除く): 20315301

約数列:

[1, 3, 5, 7, 15, 21, 35, 43, 47, 103, 105, 129, 141, 215, 235, 301, 309, 329, 515, 645, 705, 721, 903, 987, 1505, 1545, 1645, 2021, 2163, 3605, 4429, 4515, 4841, 4935, 6063, 10105, 10815, 13287, 14147, 14523, 22145, 24205, 30315, 31003, 33887, 42441, 66435, 70735, 72615, 93009, 101661, 155015, 169435, 208163, 212205, 465045, 508305, 624489, 1040815, 1457141, 3122445, 4371423, 7285705, 21857115]

約数ペア:

[(1, 21857115), (3, 7285705), (5, 4371423), (7, 3122445), (15, 1457141), (21, 1040815), (35, 624489), (43, 508305), (47, 465045), (103, 212205), (105, 208163), (129, 169435), (141, 155015), (215, 101661), (235, 93009), (301, 72615), (309, 70735), (329, 66435), (515, 42441), (645, 33887), (705, 31003), (721, 30315), (903, 24205), (987, 22145), (1505, 14523), (1545, 14147), (1645, 13287), (2021, 10815), (2163, 10105), (3605, 6063), (4429, 4935), (4515, 4841)]