20012720

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{2749}}^1$

素因数の和:2782

約数の個数: 80

約数和(自身を含む): 57288000

約数和(自身を除く): 37275280

約数列:

[1, 2, 4, 5, 7, 8, 10, 13, 14, 16, 20, 26, 28, 35, 40, 52, 56, 65, 70, 80, 91, 104, 112, 130, 140, 182, 208, 260, 280, 364, 455, 520, 560, 728, 910, 1040, 1456, 1820, 2749, 3640, 5498, 7280, 10996, 13745, 19243, 21992, 27490, 35737, 38486, 43984, 54980, 71474, 76972, 96215, 109960, 142948, 153944, 178685, 192430, 219920, 250159, 285896, 307888, 357370, 384860, 500318, 571792, 714740, 769720, 1000636, 1250795, 1429480, 1539440, 2001272, 2501590, 2858960, 4002544, 5003180, 10006360, 20012720]

約数ペア:

[(1, 20012720), (2, 10006360), (4, 5003180), (5, 4002544), (7, 2858960), (8, 2501590), (10, 2001272), (13, 1539440), (14, 1429480), (16, 1250795), (20, 1000636), (26, 769720), (28, 714740), (35, 571792), (40, 500318), (52, 384860), (56, 357370), (65, 307888), (70, 285896), (80, 250159), (91, 219920), (104, 192430), (112, 178685), (130, 153944), (140, 142948), (182, 109960), (208, 96215), (260, 76972), (280, 71474), (364, 54980), (455, 43984), (520, 38486), (560, 35737), (728, 27490), (910, 21992), (1040, 19243), (1456, 13745), (1820, 10996), (2749, 7280), (3640, 5498)]