20919990

素因数分解:

$2^1\times 3^1\times 5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{79}}^1\times {\mathrm{97}}^1$

素因数の和:206

約数の個数: 128

約数和(自身を含む): 63221760

約数和(自身を除く): 42301770

約数列:

[1, 2, 3, 5, 6, 7, 10, 13, 14, 15, 21, 26, 30, 35, 39, 42, 65, 70, 78, 79, 91, 97, 105, 130, 158, 182, 194, 195, 210, 237, 273, 291, 390, 395, 455, 474, 485, 546, 553, 582, 679, 790, 910, 970, 1027, 1106, 1185, 1261, 1358, 1365, 1455, 1659, 2037, 2054, 2370, 2522, 2730, 2765, 2910, 3081, 3318, 3395, 3783, 4074, 5135, 5530, 6162, 6305, 6790, 7189, 7566, 7663, 8295, 8827, 10185, 10270, 12610, 14378, 15326, 15405, 16590, 17654, 18915, 20370, 21567, 22989, 26481, 30810, 35945, 37830, 38315, 43134, 44135, 45978, 52962, 53641, 71890, 76630, 88270, 99619, 107282, 107835, 114945, 132405, 160923, 199238, 215670, 229890, 264810, 268205, 298857, 321846, 498095, 536410, 597714, 697333, 804615, 996190, 1394666, 1494285, 1609230, 2091999, 2988570, 3486665, 4183998, 6973330, 10459995, 20919990]

約数ペア:

[(1, 20919990), (2, 10459995), (3, 6973330), (5, 4183998), (6, 3486665), (7, 2988570), (10, 2091999), (13, 1609230), (14, 1494285), (15, 1394666), (21, 996190), (26, 804615), (30, 697333), (35, 597714), (39, 536410), (42, 498095), (65, 321846), (70, 298857), (78, 268205), (79, 264810), (91, 229890), (97, 215670), (105, 199238), (130, 160923), (158, 132405), (182, 114945), (194, 107835), (195, 107282), (210, 99619), (237, 88270), (273, 76630), (291, 71890), (390, 53641), (395, 52962), (455, 45978), (474, 44135), (485, 43134), (546, 38315), (553, 37830), (582, 35945), (679, 30810), (790, 26481), (910, 22989), (970, 21567), (1027, 20370), (1106, 18915), (1185, 17654), (1261, 16590), (1358, 15405), (1365, 15326), (1455, 14378), (1659, 12610), (2037, 10270), (2054, 10185), (2370, 8827), (2522, 8295), (2730, 7663), (2765, 7566), (2910, 7189), (3081, 6790), (3318, 6305), (3395, 6162), (3783, 5530), (4074, 5135)]