399784240

素因数分解:

$2^4\times 5^1\times {\mathrm{17}}^1\times {\mathrm{61}}^2\times {\mathrm{79}}^1$

素因数の和:231

約数の個数: 120

約数和(自身を含む): 1013238720

約数和(自身を除く): 613454480

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 34, 40, 61, 68, 79, 80, 85, 122, 136, 158, 170, 244, 272, 305, 316, 340, 395, 488, 610, 632, 680, 790, 976, 1037, 1220, 1264, 1343, 1360, 1580, 2074, 2440, 2686, 3160, 3721, 4148, 4819, 4880, 5185, 5372, 6320, 6715, 7442, 8296, 9638, 10370, 10744, 13430, 14884, 16592, 18605, 19276, 20740, 21488, 24095, 26860, 29768, 37210, 38552, 41480, 48190, 53720, 59536, 63257, 74420, 77104, 81923, 82960, 96380, 107440, 126514, 148840, 163846, 192760, 253028, 293959, 297680, 316285, 327692, 385520, 409615, 506056, 587918, 632570, 655384, 819230, 1012112, 1175836, 1265140, 1310768, 1469795, 1638460, 2351672, 2530280, 2939590, 3276920, 4703344, 4997303, 5060560, 5879180, 6553840, 9994606, 11758360, 19989212, 23516720, 24986515, 39978424, 49973030, 79956848, 99946060, 199892120, 399784240]

約数ペア:

[(1, 399784240), (2, 199892120), (4, 99946060), (5, 79956848), (8, 49973030), (10, 39978424), (16, 24986515), (17, 23516720), (20, 19989212), (34, 11758360), (40, 9994606), (61, 6553840), (68, 5879180), (79, 5060560), (80, 4997303), (85, 4703344), (122, 3276920), (136, 2939590), (158, 2530280), (170, 2351672), (244, 1638460), (272, 1469795), (305, 1310768), (316, 1265140), (340, 1175836), (395, 1012112), (488, 819230), (610, 655384), (632, 632570), (680, 587918), (790, 506056), (976, 409615), (1037, 385520), (1220, 327692), (1264, 316285), (1343, 297680), (1360, 293959), (1580, 253028), (2074, 192760), (2440, 163846), (2686, 148840), (3160, 126514), (3721, 107440), (4148, 96380), (4819, 82960), (4880, 81923), (5185, 77104), (5372, 74420), (6320, 63257), (6715, 59536), (7442, 53720), (8296, 48190), (9638, 41480), (10370, 38552), (10744, 37210), (13430, 29768), (14884, 26860), (16592, 24095), (18605, 21488), (19276, 20740)]