20964825

素因数分解:

$3^5\times 5^2\times 7^1\times {\mathrm{17}}^1\times {\mathrm{29}}^1$

素因数の和:78

約数の個数: 144

約数和(自身を含む): 48746880

約数和(自身を除く): 27782055

約数列:

[1, 3, 5, 7, 9, 15, 17, 21, 25, 27, 29, 35, 45, 51, 63, 75, 81, 85, 87, 105, 119, 135, 145, 153, 175, 189, 203, 225, 243, 255, 261, 315, 357, 405, 425, 435, 459, 493, 525, 567, 595, 609, 675, 725, 765, 783, 945, 1015, 1071, 1215, 1275, 1305, 1377, 1479, 1575, 1701, 1785, 1827, 2025, 2175, 2295, 2349, 2465, 2835, 2975, 3045, 3213, 3451, 3825, 3915, 4131, 4437, 4725, 5075, 5355, 5481, 6075, 6525, 6885, 7047, 7395, 8505, 8925, 9135, 9639, 10353, 11475, 11745, 12325, 13311, 14175, 15225, 16065, 16443, 17255, 19575, 20655, 22185, 26775, 27405, 28917, 31059, 34425, 35235, 36975, 39933, 42525, 45675, 48195, 49329, 51765, 58725, 66555, 80325, 82215, 86275, 93177, 103275, 110925, 119799, 137025, 144585, 155295, 176175, 199665, 240975, 246645, 258825, 279531, 332775, 411075, 465885, 598995, 722925, 776475, 838593, 998325, 1233225, 1397655, 2329425, 2994975, 4192965, 6988275, 20964825]

約数ペア:

[(1, 20964825), (3, 6988275), (5, 4192965), (7, 2994975), (9, 2329425), (15, 1397655), (17, 1233225), (21, 998325), (25, 838593), (27, 776475), (29, 722925), (35, 598995), (45, 465885), (51, 411075), (63, 332775), (75, 279531), (81, 258825), (85, 246645), (87, 240975), (105, 199665), (119, 176175), (135, 155295), (145, 144585), (153, 137025), (175, 119799), (189, 110925), (203, 103275), (225, 93177), (243, 86275), (255, 82215), (261, 80325), (315, 66555), (357, 58725), (405, 51765), (425, 49329), (435, 48195), (459, 45675), (493, 42525), (525, 39933), (567, 36975), (595, 35235), (609, 34425), (675, 31059), (725, 28917), (765, 27405), (783, 26775), (945, 22185), (1015, 20655), (1071, 19575), (1215, 17255), (1275, 16443), (1305, 16065), (1377, 15225), (1479, 14175), (1575, 13311), (1701, 12325), (1785, 11745), (1827, 11475), (2025, 10353), (2175, 9639), (2295, 9135), (2349, 8925), (2465, 8505), (2835, 7395), (2975, 7047), (3045, 6885), (3213, 6525), (3451, 6075), (3825, 5481), (3915, 5355), (4131, 5075), (4437, 4725)]