81797660

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{19}}^1\times {\mathrm{23}}^1\times {\mathrm{191}}^1$

素因数の和:256

約数の個数: 144

約数和(自身を含む): 220631040

約数和(自身を除く): 138833380

約数列:

[1, 2, 4, 5, 7, 10, 14, 19, 20, 23, 28, 35, 38, 46, 49, 70, 76, 92, 95, 98, 115, 133, 140, 161, 190, 191, 196, 230, 245, 266, 322, 380, 382, 437, 460, 490, 532, 644, 665, 764, 805, 874, 931, 955, 980, 1127, 1330, 1337, 1610, 1748, 1862, 1910, 2185, 2254, 2660, 2674, 3059, 3220, 3629, 3724, 3820, 4370, 4393, 4508, 4655, 5348, 5635, 6118, 6685, 7258, 8740, 8786, 9310, 9359, 11270, 12236, 13370, 14516, 15295, 17572, 18145, 18620, 18718, 21413, 21965, 22540, 25403, 26740, 30590, 30751, 36290, 37436, 42826, 43930, 46795, 50806, 61180, 61502, 72580, 83467, 85652, 87860, 93590, 101612, 107065, 123004, 127015, 153755, 166934, 177821, 187180, 214130, 215257, 254030, 307510, 333868, 355642, 417335, 428260, 430514, 508060, 584269, 615020, 711284, 834670, 861028, 889105, 1076285, 1168538, 1669340, 1778210, 2152570, 2337076, 2921345, 3556420, 4089883, 4305140, 5842690, 8179766, 11685380, 16359532, 20449415, 40898830, 81797660]

約数ペア:

[(1, 81797660), (2, 40898830), (4, 20449415), (5, 16359532), (7, 11685380), (10, 8179766), (14, 5842690), (19, 4305140), (20, 4089883), (23, 3556420), (28, 2921345), (35, 2337076), (38, 2152570), (46, 1778210), (49, 1669340), (70, 1168538), (76, 1076285), (92, 889105), (95, 861028), (98, 834670), (115, 711284), (133, 615020), (140, 584269), (161, 508060), (190, 430514), (191, 428260), (196, 417335), (230, 355642), (245, 333868), (266, 307510), (322, 254030), (380, 215257), (382, 214130), (437, 187180), (460, 177821), (490, 166934), (532, 153755), (644, 127015), (665, 123004), (764, 107065), (805, 101612), (874, 93590), (931, 87860), (955, 85652), (980, 83467), (1127, 72580), (1330, 61502), (1337, 61180), (1610, 50806), (1748, 46795), (1862, 43930), (1910, 42826), (2185, 37436), (2254, 36290), (2660, 30751), (2674, 30590), (3059, 26740), (3220, 25403), (3629, 22540), (3724, 21965), (3820, 21413), (4370, 18718), (4393, 18620), (4508, 18145), (4655, 17572), (5348, 15295), (5635, 14516), (6118, 13370), (6685, 12236), (7258, 11270), (8740, 9359), (8786, 9310)]