19989990

素因数分解:

$2^1\times 3^4\times 5^1\times {\mathrm{23}}^1\times {\mathrm{29}}^1\times {\mathrm{37}}^1$

素因数の和:108

約数の個数: 160

約数和(自身を含む): 59590080

約数和(自身を除く): 39600090

約数列:

[1, 2, 3, 5, 6, 9, 10, 15, 18, 23, 27, 29, 30, 37, 45, 46, 54, 58, 69, 74, 81, 87, 90, 111, 115, 135, 138, 145, 162, 174, 185, 207, 222, 230, 261, 270, 290, 333, 345, 370, 405, 414, 435, 522, 555, 621, 666, 667, 690, 783, 810, 851, 870, 999, 1035, 1073, 1110, 1242, 1305, 1334, 1566, 1665, 1702, 1863, 1998, 2001, 2070, 2146, 2349, 2553, 2610, 2997, 3105, 3219, 3330, 3335, 3726, 3915, 4002, 4255, 4698, 4995, 5106, 5365, 5994, 6003, 6210, 6438, 6670, 7659, 7830, 8510, 9315, 9657, 9990, 10005, 10730, 11745, 12006, 12765, 14985, 15318, 16095, 18009, 18630, 19314, 20010, 22977, 23490, 24679, 25530, 28971, 29970, 30015, 32190, 36018, 38295, 45954, 48285, 49358, 54027, 57942, 60030, 68931, 74037, 76590, 86913, 90045, 96570, 108054, 114885, 123395, 137862, 144855, 148074, 173826, 180090, 222111, 229770, 246790, 270135, 289710, 344655, 370185, 434565, 444222, 540270, 666333, 689310, 740370, 869130, 1110555, 1332666, 1998999, 2221110, 3331665, 3997998, 6663330, 9994995, 19989990]

約数ペア:

[(1, 19989990), (2, 9994995), (3, 6663330), (5, 3997998), (6, 3331665), (9, 2221110), (10, 1998999), (15, 1332666), (18, 1110555), (23, 869130), (27, 740370), (29, 689310), (30, 666333), (37, 540270), (45, 444222), (46, 434565), (54, 370185), (58, 344655), (69, 289710), (74, 270135), (81, 246790), (87, 229770), (90, 222111), (111, 180090), (115, 173826), (135, 148074), (138, 144855), (145, 137862), (162, 123395), (174, 114885), (185, 108054), (207, 96570), (222, 90045), (230, 86913), (261, 76590), (270, 74037), (290, 68931), (333, 60030), (345, 57942), (370, 54027), (405, 49358), (414, 48285), (435, 45954), (522, 38295), (555, 36018), (621, 32190), (666, 30015), (667, 29970), (690, 28971), (783, 25530), (810, 24679), (851, 23490), (870, 22977), (999, 20010), (1035, 19314), (1073, 18630), (1110, 18009), (1242, 16095), (1305, 15318), (1334, 14985), (1566, 12765), (1665, 12006), (1702, 11745), (1863, 10730), (1998, 10005), (2001, 9990), (2070, 9657), (2146, 9315), (2349, 8510), (2553, 7830), (2610, 7659), (2997, 6670), (3105, 6438), (3219, 6210), (3330, 6003), (3335, 5994), (3726, 5365), (3915, 5106), (4002, 4995), (4255, 4698)]