20742800

素因数分解:

$2^4\times 5^2\times {\mathrm{13}}^1\times {\mathrm{3989}}^1$

素因数の和:4020

約数の個数: 60

約数和(自身を含む): 53681460

約数和(自身を除く): 32938660

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 25, 26, 40, 50, 52, 65, 80, 100, 104, 130, 200, 208, 260, 325, 400, 520, 650, 1040, 1300, 2600, 3989, 5200, 7978, 15956, 19945, 31912, 39890, 51857, 63824, 79780, 99725, 103714, 159560, 199450, 207428, 259285, 319120, 398900, 414856, 518570, 797800, 829712, 1037140, 1296425, 1595600, 2074280, 2592850, 4148560, 5185700, 10371400, 20742800]

約数ペア:

[(1, 20742800), (2, 10371400), (4, 5185700), (5, 4148560), (8, 2592850), (10, 2074280), (13, 1595600), (16, 1296425), (20, 1037140), (25, 829712), (26, 797800), (40, 518570), (50, 414856), (52, 398900), (65, 319120), (80, 259285), (100, 207428), (104, 199450), (130, 159560), (200, 103714), (208, 99725), (260, 79780), (325, 63824), (400, 51857), (520, 39890), (650, 31912), (1040, 19945), (1300, 15956), (2600, 7978), (3989, 5200)]