20495520

素因数分解:

$2^5\times 3^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{331}}^1$

素因数の和:395

約数の個数: 144

約数和(自身を含む): 71783712

約数和(自身を除く): 51288192

約数列:

[1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 16, 18, 20, 24, 30, 32, 36, 40, 43, 45, 48, 60, 72, 80, 86, 90, 96, 120, 129, 144, 160, 172, 180, 215, 240, 258, 288, 331, 344, 360, 387, 430, 480, 516, 645, 662, 688, 720, 774, 860, 993, 1032, 1290, 1324, 1376, 1440, 1548, 1655, 1720, 1935, 1986, 2064, 2580, 2648, 2979, 3096, 3310, 3440, 3870, 3972, 4128, 4965, 5160, 5296, 5958, 6192, 6620, 6880, 7740, 7944, 9930, 10320, 10592, 11916, 12384, 13240, 14233, 14895, 15480, 15888, 19860, 20640, 23832, 26480, 28466, 29790, 30960, 31776, 39720, 42699, 47664, 52960, 56932, 59580, 61920, 71165, 79440, 85398, 95328, 113864, 119160, 128097, 142330, 158880, 170796, 213495, 227728, 238320, 256194, 284660, 341592, 426990, 455456, 476640, 512388, 569320, 640485, 683184, 853980, 1024776, 1138640, 1280970, 1366368, 1707960, 2049552, 2277280, 2561940, 3415920, 4099104, 5123880, 6831840, 10247760, 20495520]

約数ペア:

[(1, 20495520), (2, 10247760), (3, 6831840), (4, 5123880), (5, 4099104), (6, 3415920), (8, 2561940), (9, 2277280), (10, 2049552), (12, 1707960), (15, 1366368), (16, 1280970), (18, 1138640), (20, 1024776), (24, 853980), (30, 683184), (32, 640485), (36, 569320), (40, 512388), (43, 476640), (45, 455456), (48, 426990), (60, 341592), (72, 284660), (80, 256194), (86, 238320), (90, 227728), (96, 213495), (120, 170796), (129, 158880), (144, 142330), (160, 128097), (172, 119160), (180, 113864), (215, 95328), (240, 85398), (258, 79440), (288, 71165), (331, 61920), (344, 59580), (360, 56932), (387, 52960), (430, 47664), (480, 42699), (516, 39720), (645, 31776), (662, 30960), (688, 29790), (720, 28466), (774, 26480), (860, 23832), (993, 20640), (1032, 19860), (1290, 15888), (1324, 15480), (1376, 14895), (1440, 14233), (1548, 13240), (1655, 12384), (1720, 11916), (1935, 10592), (1986, 10320), (2064, 9930), (2580, 7944), (2648, 7740), (2979, 6880), (3096, 6620), (3310, 6192), (3440, 5958), (3870, 5296), (3972, 5160), (4128, 4965)]