640640

素因数分解:

$2^7\times 5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1$

素因数の和:50

約数の個数: 128

約数和(自身を含む): 2056320

約数和(自身を除く): 1415680

約数列:

[1, 2, 4, 5, 7, 8, 10, 11, 13, 14, 16, 20, 22, 26, 28, 32, 35, 40, 44, 52, 55, 56, 64, 65, 70, 77, 80, 88, 91, 104, 110, 112, 128, 130, 140, 143, 154, 160, 176, 182, 208, 220, 224, 260, 280, 286, 308, 320, 352, 364, 385, 416, 440, 448, 455, 520, 560, 572, 616, 640, 704, 715, 728, 770, 832, 880, 896, 910, 1001, 1040, 1120, 1144, 1232, 1408, 1430, 1456, 1540, 1664, 1760, 1820, 2002, 2080, 2240, 2288, 2464, 2860, 2912, 3080, 3520, 3640, 4004, 4160, 4480, 4576, 4928, 5005, 5720, 5824, 6160, 7040, 7280, 8008, 8320, 9152, 9856, 10010, 11440, 11648, 12320, 14560, 16016, 18304, 20020, 22880, 24640, 29120, 32032, 40040, 45760, 49280, 58240, 64064, 80080, 91520, 128128, 160160, 320320, 640640]

約数ペア:

[(1, 640640), (2, 320320), (4, 160160), (5, 128128), (7, 91520), (8, 80080), (10, 64064), (11, 58240), (13, 49280), (14, 45760), (16, 40040), (20, 32032), (22, 29120), (26, 24640), (28, 22880), (32, 20020), (35, 18304), (40, 16016), (44, 14560), (52, 12320), (55, 11648), (56, 11440), (64, 10010), (65, 9856), (70, 9152), (77, 8320), (80, 8008), (88, 7280), (91, 7040), (104, 6160), (110, 5824), (112, 5720), (128, 5005), (130, 4928), (140, 4576), (143, 4480), (154, 4160), (160, 4004), (176, 3640), (182, 3520), (208, 3080), (220, 2912), (224, 2860), (260, 2464), (280, 2288), (286, 2240), (308, 2080), (320, 2002), (352, 1820), (364, 1760), (385, 1664), (416, 1540), (440, 1456), (448, 1430), (455, 1408), (520, 1232), (560, 1144), (572, 1120), (616, 1040), (640, 1001), (704, 910), (715, 896), (728, 880), (770, 832)]