20180020

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{17}}^1\times {\mathrm{61}}^1\times {\mathrm{139}}^1$

素因数の和:233

約数の個数: 96

約数和(自身を含む): 52496640

約数和(自身を除く): 32316620

約数列:

[1, 2, 4, 5, 7, 10, 14, 17, 20, 28, 34, 35, 61, 68, 70, 85, 119, 122, 139, 140, 170, 238, 244, 278, 305, 340, 427, 476, 556, 595, 610, 695, 854, 973, 1037, 1190, 1220, 1390, 1708, 1946, 2074, 2135, 2363, 2380, 2780, 3892, 4148, 4270, 4726, 4865, 5185, 7259, 8479, 8540, 9452, 9730, 10370, 11815, 14518, 16541, 16958, 19460, 20740, 23630, 29036, 33082, 33916, 36295, 42395, 47260, 59353, 66164, 72590, 82705, 84790, 118706, 144143, 145180, 165410, 169580, 237412, 288286, 296765, 330820, 576572, 593530, 720715, 1009001, 1187060, 1441430, 2018002, 2882860, 4036004, 5045005, 10090010, 20180020]

約数ペア:

[(1, 20180020), (2, 10090010), (4, 5045005), (5, 4036004), (7, 2882860), (10, 2018002), (14, 1441430), (17, 1187060), (20, 1009001), (28, 720715), (34, 593530), (35, 576572), (61, 330820), (68, 296765), (70, 288286), (85, 237412), (119, 169580), (122, 165410), (139, 145180), (140, 144143), (170, 118706), (238, 84790), (244, 82705), (278, 72590), (305, 66164), (340, 59353), (427, 47260), (476, 42395), (556, 36295), (595, 33916), (610, 33082), (695, 29036), (854, 23630), (973, 20740), (1037, 19460), (1190, 16958), (1220, 16541), (1390, 14518), (1708, 11815), (1946, 10370), (2074, 9730), (2135, 9452), (2363, 8540), (2380, 8479), (2780, 7259), (3892, 5185), (4148, 4865), (4270, 4726)]