20842640

素因数分解:

$2^4\times 5^1\times 7^2\times {\mathrm{13}}^1\times {\mathrm{409}}^1$

素因数の和:449

約数の個数: 120

約数和(自身を含む): 60855480

約数和(自身を除く): 40012840

約数列:

[1, 2, 4, 5, 7, 8, 10, 13, 14, 16, 20, 26, 28, 35, 40, 49, 52, 56, 65, 70, 80, 91, 98, 104, 112, 130, 140, 182, 196, 208, 245, 260, 280, 364, 392, 409, 455, 490, 520, 560, 637, 728, 784, 818, 910, 980, 1040, 1274, 1456, 1636, 1820, 1960, 2045, 2548, 2863, 3185, 3272, 3640, 3920, 4090, 5096, 5317, 5726, 6370, 6544, 7280, 8180, 10192, 10634, 11452, 12740, 14315, 16360, 20041, 21268, 22904, 25480, 26585, 28630, 32720, 37219, 40082, 42536, 45808, 50960, 53170, 57260, 74438, 80164, 85072, 100205, 106340, 114520, 148876, 160328, 186095, 200410, 212680, 229040, 260533, 297752, 320656, 372190, 400820, 425360, 521066, 595504, 744380, 801640, 1042132, 1302665, 1488760, 1603280, 2084264, 2605330, 2977520, 4168528, 5210660, 10421320, 20842640]

約数ペア:

[(1, 20842640), (2, 10421320), (4, 5210660), (5, 4168528), (7, 2977520), (8, 2605330), (10, 2084264), (13, 1603280), (14, 1488760), (16, 1302665), (20, 1042132), (26, 801640), (28, 744380), (35, 595504), (40, 521066), (49, 425360), (52, 400820), (56, 372190), (65, 320656), (70, 297752), (80, 260533), (91, 229040), (98, 212680), (104, 200410), (112, 186095), (130, 160328), (140, 148876), (182, 114520), (196, 106340), (208, 100205), (245, 85072), (260, 80164), (280, 74438), (364, 57260), (392, 53170), (409, 50960), (455, 45808), (490, 42536), (520, 40082), (560, 37219), (637, 32720), (728, 28630), (784, 26585), (818, 25480), (910, 22904), (980, 21268), (1040, 20041), (1274, 16360), (1456, 14315), (1636, 12740), (1820, 11452), (1960, 10634), (2045, 10192), (2548, 8180), (2863, 7280), (3185, 6544), (3272, 6370), (3640, 5726), (3920, 5317), (4090, 5096)]