21381240

素因数分解:

$2^3\times 3^1\times 5^1\times {\mathrm{17}}^1\times {\mathrm{47}}^1\times {\mathrm{223}}^1$

素因数の和:301

約数の個数: 128

約数和(自身を含む): 69672960

約数和(自身を除く): 48291720

約数列:

[1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 17, 20, 24, 30, 34, 40, 47, 51, 60, 68, 85, 94, 102, 120, 136, 141, 170, 188, 204, 223, 235, 255, 282, 340, 376, 408, 446, 470, 510, 564, 669, 680, 705, 799, 892, 940, 1020, 1115, 1128, 1338, 1410, 1598, 1784, 1880, 2040, 2230, 2397, 2676, 2820, 3196, 3345, 3791, 3995, 4460, 4794, 5352, 5640, 6392, 6690, 7582, 7990, 8920, 9588, 10481, 11373, 11985, 13380, 15164, 15980, 18955, 19176, 20962, 22746, 23970, 26760, 30328, 31443, 31960, 37910, 41924, 45492, 47940, 52405, 56865, 62886, 75820, 83848, 90984, 95880, 104810, 113730, 125772, 151640, 157215, 178177, 209620, 227460, 251544, 314430, 356354, 419240, 454920, 534531, 628860, 712708, 890885, 1069062, 1257720, 1425416, 1781770, 2138124, 2672655, 3563540, 4276248, 5345310, 7127080, 10690620, 21381240]

約数ペア:

[(1, 21381240), (2, 10690620), (3, 7127080), (4, 5345310), (5, 4276248), (6, 3563540), (8, 2672655), (10, 2138124), (12, 1781770), (15, 1425416), (17, 1257720), (20, 1069062), (24, 890885), (30, 712708), (34, 628860), (40, 534531), (47, 454920), (51, 419240), (60, 356354), (68, 314430), (85, 251544), (94, 227460), (102, 209620), (120, 178177), (136, 157215), (141, 151640), (170, 125772), (188, 113730), (204, 104810), (223, 95880), (235, 90984), (255, 83848), (282, 75820), (340, 62886), (376, 56865), (408, 52405), (446, 47940), (470, 45492), (510, 41924), (564, 37910), (669, 31960), (680, 31443), (705, 30328), (799, 26760), (892, 23970), (940, 22746), (1020, 20962), (1115, 19176), (1128, 18955), (1338, 15980), (1410, 15164), (1598, 13380), (1784, 11985), (1880, 11373), (2040, 10481), (2230, 9588), (2397, 8920), (2676, 7990), (2820, 7582), (3196, 6690), (3345, 6392), (3791, 5640), (3995, 5352), (4460, 4794)]