20991180

素因数分解:

$2^2\times 3^1\times 5^1\times 7^1\times {\mathrm{23}}^1\times {\mathrm{41}}^1\times {\mathrm{53}}^1$

素因数の和:136

約数の個数: 192

約数和(自身を含む): 73156608

約数和(自身を除く): 52165428

約数列:

[1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 23, 28, 30, 35, 41, 42, 46, 53, 60, 69, 70, 82, 84, 92, 105, 106, 115, 123, 138, 140, 159, 161, 164, 205, 210, 212, 230, 246, 265, 276, 287, 318, 322, 345, 371, 410, 420, 460, 483, 492, 530, 574, 615, 636, 644, 690, 742, 795, 805, 820, 861, 943, 966, 1060, 1113, 1148, 1219, 1230, 1380, 1435, 1484, 1590, 1610, 1722, 1855, 1886, 1932, 2173, 2226, 2415, 2438, 2460, 2829, 2870, 3180, 3220, 3444, 3657, 3710, 3772, 4305, 4346, 4452, 4715, 4830, 4876, 5565, 5658, 5740, 6095, 6519, 6601, 7314, 7420, 8533, 8610, 8692, 9430, 9660, 10865, 11130, 11316, 12190, 13038, 13202, 14145, 14628, 15211, 17066, 17220, 18285, 18860, 19803, 21730, 22260, 24380, 25599, 26076, 26404, 28290, 30422, 32595, 33005, 34132, 36570, 39606, 42665, 43460, 45633, 49979, 51198, 56580, 60844, 65190, 66010, 73140, 76055, 79212, 85330, 91266, 99015, 99958, 102396, 127995, 130380, 132020, 149937, 152110, 170660, 182532, 198030, 199916, 228165, 249895, 255990, 299874, 304220, 349853, 396060, 456330, 499790, 511980, 599748, 699706, 749685, 912660, 999580, 1049559, 1399412, 1499370, 1749265, 2099118, 2998740, 3498530, 4198236, 5247795, 6997060, 10495590, 20991180]

約数ペア:

[(1, 20991180), (2, 10495590), (3, 6997060), (4, 5247795), (5, 4198236), (6, 3498530), (7, 2998740), (10, 2099118), (12, 1749265), (14, 1499370), (15, 1399412), (20, 1049559), (21, 999580), (23, 912660), (28, 749685), (30, 699706), (35, 599748), (41, 511980), (42, 499790), (46, 456330), (53, 396060), (60, 349853), (69, 304220), (70, 299874), (82, 255990), (84, 249895), (92, 228165), (105, 199916), (106, 198030), (115, 182532), (123, 170660), (138, 152110), (140, 149937), (159, 132020), (161, 130380), (164, 127995), (205, 102396), (210, 99958), (212, 99015), (230, 91266), (246, 85330), (265, 79212), (276, 76055), (287, 73140), (318, 66010), (322, 65190), (345, 60844), (371, 56580), (410, 51198), (420, 49979), (460, 45633), (483, 43460), (492, 42665), (530, 39606), (574, 36570), (615, 34132), (636, 33005), (644, 32595), (690, 30422), (742, 28290), (795, 26404), (805, 26076), (820, 25599), (861, 24380), (943, 22260), (966, 21730), (1060, 19803), (1113, 18860), (1148, 18285), (1219, 17220), (1230, 17066), (1380, 15211), (1435, 14628), (1484, 14145), (1590, 13202), (1610, 13038), (1722, 12190), (1855, 11316), (1886, 11130), (1932, 10865), (2173, 9660), (2226, 9430), (2415, 8692), (2438, 8610), (2460, 8533), (2829, 7420), (2870, 7314), (3180, 6601), (3220, 6519), (3444, 6095), (3657, 5740), (3710, 5658), (3772, 5565), (4305, 4876), (4346, 4830), (4452, 4715)]