20997760

素因数分解:

$2^7\times 5^1\times 7^1\times {\mathrm{43}}^1\times {\mathrm{109}}^1$

素因数の和:178

約数の個数: 128

約数和(自身を含む): 59241600

約数和(自身を除く): 38243840

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 32, 35, 40, 43, 56, 64, 70, 80, 86, 109, 112, 128, 140, 160, 172, 215, 218, 224, 280, 301, 320, 344, 430, 436, 448, 545, 560, 602, 640, 688, 763, 860, 872, 896, 1090, 1120, 1204, 1376, 1505, 1526, 1720, 1744, 2180, 2240, 2408, 2752, 3010, 3052, 3440, 3488, 3815, 4360, 4480, 4687, 4816, 5504, 6020, 6104, 6880, 6976, 7630, 8720, 9374, 9632, 12040, 12208, 13760, 13952, 15260, 17440, 18748, 19264, 23435, 24080, 24416, 27520, 30520, 32809, 34880, 37496, 38528, 46870, 48160, 48832, 61040, 65618, 69760, 74992, 93740, 96320, 97664, 122080, 131236, 149984, 164045, 187480, 192640, 244160, 262472, 299968, 328090, 374960, 488320, 524944, 599936, 656180, 749920, 1049888, 1312360, 1499840, 2099776, 2624720, 2999680, 4199552, 5249440, 10498880, 20997760]

約数ペア:

[(1, 20997760), (2, 10498880), (4, 5249440), (5, 4199552), (7, 2999680), (8, 2624720), (10, 2099776), (14, 1499840), (16, 1312360), (20, 1049888), (28, 749920), (32, 656180), (35, 599936), (40, 524944), (43, 488320), (56, 374960), (64, 328090), (70, 299968), (80, 262472), (86, 244160), (109, 192640), (112, 187480), (128, 164045), (140, 149984), (160, 131236), (172, 122080), (215, 97664), (218, 96320), (224, 93740), (280, 74992), (301, 69760), (320, 65618), (344, 61040), (430, 48832), (436, 48160), (448, 46870), (545, 38528), (560, 37496), (602, 34880), (640, 32809), (688, 30520), (763, 27520), (860, 24416), (872, 24080), (896, 23435), (1090, 19264), (1120, 18748), (1204, 17440), (1376, 15260), (1505, 13952), (1526, 13760), (1720, 12208), (1744, 12040), (2180, 9632), (2240, 9374), (2408, 8720), (2752, 7630), (3010, 6976), (3052, 6880), (3440, 6104), (3488, 6020), (3815, 5504), (4360, 4816), (4480, 4687)]