21507720

素因数分解:

$2^3\times 3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{811}}^1$

素因数の和:855

約数の個数: 128

約数和(自身を含む): 73664640

約数和(自身を除く): 52156920

約数列:

[1, 2, 3, 4, 5, 6, 8, 10, 12, 13, 15, 17, 20, 24, 26, 30, 34, 39, 40, 51, 52, 60, 65, 68, 78, 85, 102, 104, 120, 130, 136, 156, 170, 195, 204, 221, 255, 260, 312, 340, 390, 408, 442, 510, 520, 663, 680, 780, 811, 884, 1020, 1105, 1326, 1560, 1622, 1768, 2040, 2210, 2433, 2652, 3244, 3315, 4055, 4420, 4866, 5304, 6488, 6630, 8110, 8840, 9732, 10543, 12165, 13260, 13787, 16220, 19464, 21086, 24330, 26520, 27574, 31629, 32440, 41361, 42172, 48660, 52715, 55148, 63258, 68935, 82722, 84344, 97320, 105430, 110296, 126516, 137870, 158145, 165444, 179231, 206805, 210860, 253032, 275740, 316290, 330888, 358462, 413610, 421720, 537693, 551480, 632580, 716924, 827220, 896155, 1075386, 1265160, 1433848, 1654440, 1792310, 2150772, 2688465, 3584620, 4301544, 5376930, 7169240, 10753860, 21507720]

約数ペア:

[(1, 21507720), (2, 10753860), (3, 7169240), (4, 5376930), (5, 4301544), (6, 3584620), (8, 2688465), (10, 2150772), (12, 1792310), (13, 1654440), (15, 1433848), (17, 1265160), (20, 1075386), (24, 896155), (26, 827220), (30, 716924), (34, 632580), (39, 551480), (40, 537693), (51, 421720), (52, 413610), (60, 358462), (65, 330888), (68, 316290), (78, 275740), (85, 253032), (102, 210860), (104, 206805), (120, 179231), (130, 165444), (136, 158145), (156, 137870), (170, 126516), (195, 110296), (204, 105430), (221, 97320), (255, 84344), (260, 82722), (312, 68935), (340, 63258), (390, 55148), (408, 52715), (442, 48660), (510, 42172), (520, 41361), (663, 32440), (680, 31629), (780, 27574), (811, 26520), (884, 24330), (1020, 21086), (1105, 19464), (1326, 16220), (1560, 13787), (1622, 13260), (1768, 12165), (2040, 10543), (2210, 9732), (2433, 8840), (2652, 8110), (3244, 6630), (3315, 6488), (4055, 5304), (4420, 4866)]