20978880

素因数分解:

$2^6\times 3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{41}}^2$

素因数の和:115

約数の個数: 168

約数和(自身を含む): 73523856

約数和(自身を除く): 52544976

約数列:

[1, 2, 3, 4, 5, 6, 8, 10, 12, 13, 15, 16, 20, 24, 26, 30, 32, 39, 40, 41, 48, 52, 60, 64, 65, 78, 80, 82, 96, 104, 120, 123, 130, 156, 160, 164, 192, 195, 205, 208, 240, 246, 260, 312, 320, 328, 390, 410, 416, 480, 492, 520, 533, 615, 624, 656, 780, 820, 832, 960, 984, 1040, 1066, 1230, 1248, 1312, 1560, 1599, 1640, 1681, 1968, 2080, 2132, 2460, 2496, 2624, 2665, 3120, 3198, 3280, 3362, 3936, 4160, 4264, 4920, 5043, 5330, 6240, 6396, 6560, 6724, 7872, 7995, 8405, 8528, 9840, 10086, 10660, 12480, 12792, 13120, 13448, 15990, 16810, 17056, 19680, 20172, 21320, 21853, 25215, 25584, 26896, 31980, 33620, 34112, 39360, 40344, 42640, 43706, 50430, 51168, 53792, 63960, 65559, 67240, 80688, 85280, 87412, 100860, 102336, 107584, 109265, 127920, 131118, 134480, 161376, 170560, 174824, 201720, 218530, 255840, 262236, 268960, 322752, 327795, 349648, 403440, 437060, 511680, 524472, 537920, 655590, 699296, 806880, 874120, 1048944, 1311180, 1398592, 1613760, 1748240, 2097888, 2622360, 3496480, 4195776, 5244720, 6992960, 10489440, 20978880]

約数ペア:

[(1, 20978880), (2, 10489440), (3, 6992960), (4, 5244720), (5, 4195776), (6, 3496480), (8, 2622360), (10, 2097888), (12, 1748240), (13, 1613760), (15, 1398592), (16, 1311180), (20, 1048944), (24, 874120), (26, 806880), (30, 699296), (32, 655590), (39, 537920), (40, 524472), (41, 511680), (48, 437060), (52, 403440), (60, 349648), (64, 327795), (65, 322752), (78, 268960), (80, 262236), (82, 255840), (96, 218530), (104, 201720), (120, 174824), (123, 170560), (130, 161376), (156, 134480), (160, 131118), (164, 127920), (192, 109265), (195, 107584), (205, 102336), (208, 100860), (240, 87412), (246, 85280), (260, 80688), (312, 67240), (320, 65559), (328, 63960), (390, 53792), (410, 51168), (416, 50430), (480, 43706), (492, 42640), (520, 40344), (533, 39360), (615, 34112), (624, 33620), (656, 31980), (780, 26896), (820, 25584), (832, 25215), (960, 21853), (984, 21320), (1040, 20172), (1066, 19680), (1230, 17056), (1248, 16810), (1312, 15990), (1560, 13448), (1599, 13120), (1640, 12792), (1681, 12480), (1968, 10660), (2080, 10086), (2132, 9840), (2460, 8528), (2496, 8405), (2624, 7995), (2665, 7872), (3120, 6724), (3198, 6560), (3280, 6396), (3362, 6240), (3936, 5330), (4160, 5043), (4264, 4920)]