21502280

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{103}}^1\times {\mathrm{307}}^1$

素因数の和:438

約数の個数: 64

約数和(自身を含む): 51891840

約数和(自身を除く): 30389560

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 85, 103, 136, 170, 206, 307, 340, 412, 515, 614, 680, 824, 1030, 1228, 1535, 1751, 2060, 2456, 3070, 3502, 4120, 5219, 6140, 7004, 8755, 10438, 12280, 14008, 17510, 20876, 26095, 31621, 35020, 41752, 52190, 63242, 70040, 104380, 126484, 158105, 208760, 252968, 316210, 537557, 632420, 1075114, 1264840, 2150228, 2687785, 4300456, 5375570, 10751140, 21502280]

約数ペア:

[(1, 21502280), (2, 10751140), (4, 5375570), (5, 4300456), (8, 2687785), (10, 2150228), (17, 1264840), (20, 1075114), (34, 632420), (40, 537557), (68, 316210), (85, 252968), (103, 208760), (136, 158105), (170, 126484), (206, 104380), (307, 70040), (340, 63242), (412, 52190), (515, 41752), (614, 35020), (680, 31621), (824, 26095), (1030, 20876), (1228, 17510), (1535, 14008), (1751, 12280), (2060, 10438), (2456, 8755), (3070, 7004), (3502, 6140), (4120, 5219)]