20402640

素因数分解:

$2^4\times 3^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{659}}^1$

素因数の和:721

約数の個数: 120

約数和(自身を含む): 70218720

約数和(自身を除く): 49816080

約数列:

[1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 16, 18, 20, 24, 30, 36, 40, 43, 45, 48, 60, 72, 80, 86, 90, 120, 129, 144, 172, 180, 215, 240, 258, 344, 360, 387, 430, 516, 645, 659, 688, 720, 774, 860, 1032, 1290, 1318, 1548, 1720, 1935, 1977, 2064, 2580, 2636, 3096, 3295, 3440, 3870, 3954, 5160, 5272, 5931, 6192, 6590, 7740, 7908, 9885, 10320, 10544, 11862, 13180, 15480, 15816, 19770, 23724, 26360, 28337, 29655, 30960, 31632, 39540, 47448, 52720, 56674, 59310, 79080, 85011, 94896, 113348, 118620, 141685, 158160, 170022, 226696, 237240, 255033, 283370, 340044, 425055, 453392, 474480, 510066, 566740, 680088, 850110, 1020132, 1133480, 1275165, 1360176, 1700220, 2040264, 2266960, 2550330, 3400440, 4080528, 5100660, 6800880, 10201320, 20402640]

約数ペア:

[(1, 20402640), (2, 10201320), (3, 6800880), (4, 5100660), (5, 4080528), (6, 3400440), (8, 2550330), (9, 2266960), (10, 2040264), (12, 1700220), (15, 1360176), (16, 1275165), (18, 1133480), (20, 1020132), (24, 850110), (30, 680088), (36, 566740), (40, 510066), (43, 474480), (45, 453392), (48, 425055), (60, 340044), (72, 283370), (80, 255033), (86, 237240), (90, 226696), (120, 170022), (129, 158160), (144, 141685), (172, 118620), (180, 113348), (215, 94896), (240, 85011), (258, 79080), (344, 59310), (360, 56674), (387, 52720), (430, 47448), (516, 39540), (645, 31632), (659, 30960), (688, 29655), (720, 28337), (774, 26360), (860, 23724), (1032, 19770), (1290, 15816), (1318, 15480), (1548, 13180), (1720, 11862), (1935, 10544), (1977, 10320), (2064, 9885), (2580, 7908), (2636, 7740), (3096, 6590), (3295, 6192), (3440, 5931), (3870, 5272), (3954, 5160)]