21424515

素因数分解:

$3^1\times 5^1\times 7^2\times {\mathrm{103}}^1\times {\mathrm{283}}^1$

素因数の和:408

約数の個数: 48

約数和(自身を含む): 40405248

約数和(自身を除く): 18980733

約数列:

[1, 3, 5, 7, 15, 21, 35, 49, 103, 105, 147, 245, 283, 309, 515, 721, 735, 849, 1415, 1545, 1981, 2163, 3605, 4245, 5047, 5943, 9905, 10815, 13867, 15141, 25235, 29149, 29715, 41601, 69335, 75705, 87447, 145745, 204043, 208005, 437235, 612129, 1020215, 1428301, 3060645, 4284903, 7141505, 21424515]

約数ペア:

[(1, 21424515), (3, 7141505), (5, 4284903), (7, 3060645), (15, 1428301), (21, 1020215), (35, 612129), (49, 437235), (103, 208005), (105, 204043), (147, 145745), (245, 87447), (283, 75705), (309, 69335), (515, 41601), (721, 29715), (735, 29149), (849, 25235), (1415, 15141), (1545, 13867), (1981, 10815), (2163, 9905), (3605, 5943), (4245, 5047)]