19979960

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{499}}^1$

素因数の和:541

約数の個数: 128

約数和(自身を含む): 60480000

約数和(自身を除く): 40500040

約数列:

[1, 2, 4, 5, 7, 8, 10, 11, 13, 14, 20, 22, 26, 28, 35, 40, 44, 52, 55, 56, 65, 70, 77, 88, 91, 104, 110, 130, 140, 143, 154, 182, 220, 260, 280, 286, 308, 364, 385, 440, 455, 499, 520, 572, 616, 715, 728, 770, 910, 998, 1001, 1144, 1430, 1540, 1820, 1996, 2002, 2495, 2860, 3080, 3493, 3640, 3992, 4004, 4990, 5005, 5489, 5720, 6487, 6986, 8008, 9980, 10010, 10978, 12974, 13972, 17465, 19960, 20020, 21956, 25948, 27445, 27944, 32435, 34930, 38423, 40040, 43912, 45409, 51896, 54890, 64870, 69860, 71357, 76846, 90818, 109780, 129740, 139720, 142714, 153692, 181636, 192115, 219560, 227045, 259480, 285428, 307384, 356785, 363272, 384230, 454090, 499499, 570856, 713570, 768460, 908180, 998998, 1427140, 1536920, 1816360, 1997996, 2497495, 2854280, 3995992, 4994990, 9989980, 19979960]

約数ペア:

[(1, 19979960), (2, 9989980), (4, 4994990), (5, 3995992), (7, 2854280), (8, 2497495), (10, 1997996), (11, 1816360), (13, 1536920), (14, 1427140), (20, 998998), (22, 908180), (26, 768460), (28, 713570), (35, 570856), (40, 499499), (44, 454090), (52, 384230), (55, 363272), (56, 356785), (65, 307384), (70, 285428), (77, 259480), (88, 227045), (91, 219560), (104, 192115), (110, 181636), (130, 153692), (140, 142714), (143, 139720), (154, 129740), (182, 109780), (220, 90818), (260, 76846), (280, 71357), (286, 69860), (308, 64870), (364, 54890), (385, 51896), (440, 45409), (455, 43912), (499, 40040), (520, 38423), (572, 34930), (616, 32435), (715, 27944), (728, 27445), (770, 25948), (910, 21956), (998, 20020), (1001, 19960), (1144, 17465), (1430, 13972), (1540, 12974), (1820, 10978), (1996, 10010), (2002, 9980), (2495, 8008), (2860, 6986), (3080, 6487), (3493, 5720), (3640, 5489), (3992, 5005), (4004, 4990)]