21000814900

素因数分解:

$2^2\times 5^2\times {\mathrm{13}}^1\times {\mathrm{79}}^1\times {\mathrm{204487}}^1$

素因数の和:204593

約数の個数: 72

約数和(自身を含む): 49698763520

約数和(自身を除く): 28697948620

約数列:

[1, 2, 4, 5, 10, 13, 20, 25, 26, 50, 52, 65, 79, 100, 130, 158, 260, 316, 325, 395, 650, 790, 1027, 1300, 1580, 1975, 2054, 3950, 4108, 5135, 7900, 10270, 20540, 25675, 51350, 102700, 204487, 408974, 817948, 1022435, 2044870, 2658331, 4089740, 5112175, 5316662, 10224350, 10633324, 13291655, 16154473, 20448700, 26583310, 32308946, 53166620, 64617892, 66458275, 80772365, 132916550, 161544730, 210008149, 265833100, 323089460, 403861825, 420016298, 807723650, 840032596, 1050040745, 1615447300, 2100081490, 4200162980, 5250203725, 10500407450, 21000814900]

約数ペア:

[(1, 21000814900), (2, 10500407450), (4, 5250203725), (5, 4200162980), (10, 2100081490), (13, 1615447300), (20, 1050040745), (25, 840032596), (26, 807723650), (50, 420016298), (52, 403861825), (65, 323089460), (79, 265833100), (100, 210008149), (130, 161544730), (158, 132916550), (260, 80772365), (316, 66458275), (325, 64617892), (395, 53166620), (650, 32308946), (790, 26583310), (1027, 20448700), (1300, 16154473), (1580, 13291655), (1975, 10633324), (2054, 10224350), (3950, 5316662), (4108, 5112175), (5135, 4089740), (7900, 2658331), (10270, 2044870), (20540, 1022435), (25675, 817948), (51350, 408974), (102700, 204487)]