20999440

素因数分解:

$2^4\times 5^1\times 7^2\times {\mathrm{11}}^1\times {\mathrm{487}}^1$

素因数の和:525

約数の個数: 120

約数和(自身を含む): 62085312

約数和(自身を除く): 41085872

約数列:

[1, 2, 4, 5, 7, 8, 10, 11, 14, 16, 20, 22, 28, 35, 40, 44, 49, 55, 56, 70, 77, 80, 88, 98, 110, 112, 140, 154, 176, 196, 220, 245, 280, 308, 385, 392, 440, 487, 490, 539, 560, 616, 770, 784, 880, 974, 980, 1078, 1232, 1540, 1948, 1960, 2156, 2435, 2695, 3080, 3409, 3896, 3920, 4312, 4870, 5357, 5390, 6160, 6818, 7792, 8624, 9740, 10714, 10780, 13636, 17045, 19480, 21428, 21560, 23863, 26785, 27272, 34090, 37499, 38960, 42856, 43120, 47726, 53570, 54544, 68180, 74998, 85712, 95452, 107140, 119315, 136360, 149996, 187495, 190904, 214280, 238630, 262493, 272720, 299992, 374990, 381808, 428560, 477260, 524986, 599984, 749980, 954520, 1049972, 1312465, 1499960, 1909040, 2099944, 2624930, 2999920, 4199888, 5249860, 10499720, 20999440]

約数ペア:

[(1, 20999440), (2, 10499720), (4, 5249860), (5, 4199888), (7, 2999920), (8, 2624930), (10, 2099944), (11, 1909040), (14, 1499960), (16, 1312465), (20, 1049972), (22, 954520), (28, 749980), (35, 599984), (40, 524986), (44, 477260), (49, 428560), (55, 381808), (56, 374990), (70, 299992), (77, 272720), (80, 262493), (88, 238630), (98, 214280), (110, 190904), (112, 187495), (140, 149996), (154, 136360), (176, 119315), (196, 107140), (220, 95452), (245, 85712), (280, 74998), (308, 68180), (385, 54544), (392, 53570), (440, 47726), (487, 43120), (490, 42856), (539, 38960), (560, 37499), (616, 34090), (770, 27272), (784, 26785), (880, 23863), (974, 21560), (980, 21428), (1078, 19480), (1232, 17045), (1540, 13636), (1948, 10780), (1960, 10714), (2156, 9740), (2435, 8624), (2695, 7792), (3080, 6818), (3409, 6160), (3896, 5390), (3920, 5357), (4312, 4870)]